Add support for Python3 based freeipa versions (F-27+), make Python3 default

Add configuration for F-26, F-27 and RHEL-7 to be Python2 based

roles/ipaclient/tasks/main.yml

@@ -4,8 +4,10 @@
 - name: Import variables specific to distribution
   include_vars: "{{ item }}"
   with_first_found:
-    - vars/{{ ansible_distribution }}.yml
-    - vars/default.yml
+    - "vars/{{ ansible_distribution }}-{{ ansible_distribution_version }}.yml"
+    - "vars/{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+    - "vars/{{ ansible_distribution }}.yml"
+    - "vars/default.yml"
 
 - name: Install IPA client
   include: tasks/install.yml

roles/ipaclient/vars/Fedora-25.yml

+ipaclient_package: python2-ipaclient
+ansible_python_interpreter: '/usr/bin/python2'
\ No newline at end of file

roles/ipaclient/vars/Fedora-26.yml

+ipaclient_package: python2-ipaclient
+ansible_python_interpreter: '/usr/bin/python2'
\ No newline at end of file

roles/ipaclient/vars/RedHat-7.yml

+# defaults file for ipaclient
+# vars/rhel.yml
+ipaclient_package: ipa-client
+ansible_python_interpreter: '/usr/bin/python2'
+

roles/ipaclient/vars/default.yml

 # defaults file for ipaclient
 # vars/default.yml
-ipaclient_package: freeipa-client
+ipaclient_package: python3-ipaclient
+ansible_python_interpreter: '/usr/bin/python3'