tests/trust: Improved test coverage and execution.

This patch applies several changes to the ipatrust test playbook:

* Add externally defined parameters so execution in local trust
  environments can be configured. The available parameters are:
    * winserver_admin_password: the Administrator password for the AD
      server (default: 'SomeW1Npassword')
    * winserver_domain: the AD server domain (default: 'windows.local')
    * winserver realm: the AD server realm (by default, the uppercase
      version of winserver_domain)
    * ipaserver_domain: the FreeIPA server domain (default: 'ipa.test')
    * ipaserver_realm: the FreeIPA server realm (by default, the
      uppercase version of ipaserver_domain

* Modify trust verification to check for the existence of the trust as
  it the output of `ipa trust-find`, instead of cheking for the number
  of items returned, as the number might vary.

* Add idempotency tests by re-executing tasks and verifying that no
  change was performed.

* Added tests to verify creation of trusts with different 'range_type'.

* Use a Kerberos cache for shell scripts, and destroy it on exit.

* Properly remove all `idrange` that might be created upon setting up a
  trust.

tests/trust/test_trust.yml

 ---
-- name: find trust
+- name: Test ipatrust
   hosts: "{{ ipa_test_host | default('ipaserver') }}"
   become: true
   gather_facts: false
 
+  vars:
+    adserver:
+      domain: "{{ winserver_domain | default('windows.local')}}"
+      realm: "{{ winserver_realm | default(winserver_domain) | default('windows.local') | upper }}"
+      password: "{{ winserver_admin_password | default('SomeW1Npassword') }}"
+    ipaserver:
+      domain: "{{ ipaserver_domain | default('ipa.test')}}"
+      realm: "{{ ipaserver_realm | default(ipaserver_domain) | default('ipa.test') | upper }}"
+    trust_exists: 'Realm name: {{ adserver.domain }}'
+    ad_range_exists: 'Range name: {{ adserver.realm }}_id_range'
+    ipa_range_exists: 'Range name: {{ ipaserver.realm }}_subid_range'
+
   tasks:
 
   - block:
 
-    - name: delete trust
+    - name: Delete test trust
       ipatrust:
         ipaadmin_password: SomeADMINpassword
         ipaapi_context: "{{ ipa_context | default(omit) }}"
-        realm: windows.local
+        realm: "{{ adserver.domain }}"
         state: absent
-      register: del_trust
 
-    - name: check for trust
+    - name: Clear test idranges
       shell: |
-        echo 'SomeADMINpassword' | kinit admin
-        ipa trust-find windows.local
-      register: check_find_trust
-      failed_when: "'0 trusts matched' not in check_find_trust.stdout"
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa idrange-del {{ adserver.realm }}_id_range || true
+        ipa idrange-del {{ ipaserver.realm }}_subid_range || true
+        kdestroy -c test_krb5_cache -q -A
 
-    - name: delete id range
+    - name: Add trust with range_type 'ipa-ad-trust'
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        admin: Administrator
+        trust_type: ad
+        range_type: ipa-ad-trust
+        password: "{{ adserver.password }}"
+        state: present
+      register: result
+      failed_when: result.failed or not result.changed
+
+    - name: check if 'ipa-ad-trust' trust exists
       shell: |
         echo 'SomeADMINpassword' | kinit admin
-        ipa idrange-del WINDOWS.LOCAL_id_range
-      when: del_trust['changed'] | bool
+        ipa trust-find
+        kdestroy -c test_krb5_cache -q -A
+      register: check_add_trust
+      failed_when: "trust_exists not in check_add_trust.stdout"
 
-    - name: check for range
+    - name: Add trust with range_type 'ipa-ad-trust', again
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        admin: Administrator
+        range_type: ipa-ad-trust
+        password: "{{ adserver.password }}"
+        state: present
+      register: result
+      failed_when: result.failed or result.changed
+
+    - name: Delete 'ipa-ad-trust' trust
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        state: absent
+      register: result
+      failed_when: result.failed or not result.changed
+
+    - name: Check if 'ipa-ad-trust' trust was removed
       shell: |
-        echo 'SomeADMINpassword' | kinit admin
-        ipa idrange-find WINDOWS.LOCAL_id_range
-      register: check_del_idrange
-      failed_when: "'0 ranges matched' not in check_del_idrange.stdout"
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa trust-find
+        kdestroy -c test_krb5_cache -q -A
+      register: check_add_trust
+      failed_when: "trust_exists in check_add_trust.stdout"
+
+    - name: Delete 'ipa-ad-trust' trust, again
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        state: absent
+      register: result
+      failed_when: result.failed or result.changed
+
+    - name: Clear test idranges
+      shell: |
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa idrange-del {{ adserver.realm }}_id_range || true
+        ipa idrange-del {{ ipaserver.realm }}_subid_range || true
+        kdestroy -c test_krb5_cache -q -A
 
-    - name: add trust
+    - name: Add trust with range_type 'ipa-ad-trust-posix'
       ipatrust:
         ipaadmin_password: SomeADMINpassword
         ipaapi_context: "{{ ipa_context | default(omit) }}"
-        realm: windows.local
+        realm: "{{ adserver.domain }}"
         admin: Administrator
-        password: secret_ad_pw
+        range_type: ipa-ad-trust-posix
+        password: "{{ adserver.password }}"
         state: present
+      register: result
+      failed_when: result.failed or not result.changed
 
-    - name: check for trust
+    - name: Check if 'ipa-ad-trust-posix' trust exists
       shell: |
-        echo 'SomeADMINpassword' | kinit admin
-        ipa trust-find windows.local
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa trust-find
+        kdestroy -c test_krb5_cache -q -A
       register: check_add_trust
-      failed_when: "'1 trust matched' not in check_add_trust.stdout"
+      failed_when: "trust_exists not in check_add_trust.stdout"
+
+    - name: Add trust with range_type 'ipa-ad-trust-posix', again
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        admin: Administrator
+        range_type: ipa-ad-trust-posix
+        password: "{{ adserver.password }}"
+        state: present
+      register: result
+      failed_when: result.failed or result.changed
+
+    - name: Delete 'ipa-ad-trust-posix' trust
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        state: absent
+      register: result
+      failed_when: result.failed or not result.changed
+
+    - name: Check if trust 'ipa-ad-trust-posix' was removed
+      shell: |
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa trust-find
+        kdestroy -c test_krb5_cache -q -A
+      register: check_del_trust
+      failed_when: "trust_exists in check_del_trust.stdout"
+
+    - name: Delete 'ipa-ad-trust-posix' trust, again
+      ipatrust:
+        ipaadmin_password: SomeADMINpassword
+        ipaapi_context: "{{ ipa_context | default(omit) }}"
+        realm: "{{ adserver.domain }}"
+        state: absent
+      register: result
+      failed_when: result.failed or result.changed
+
+    - name: Clear test idranges
+      shell: |
+        kinit -c test_krb5_cache admin <<< SomeADMINpassword
+        ipa idrange-del {{ adserver.realm }}_id_range || true
+        ipa idrange-del {{ ipaserver.realm }}_subid_range || true
+        kdestroy -c test_krb5_cache -q -A
 
     when: trust_test_is_supported | default(false)