utils/templates/test_module*.yml.in: Better docs for become and gather_facts

The documentation for "become" and "gather_facts" has been updated to
make sure that these parameters are enabled only in new tests if it is
really needed.

utils/templates/test_module+member.yml.in

 ---
 - name: Test $name
   hosts: "{{ ipa_test_host | default('ipaserver') }}"
-  # Change "become" or "gather_facts" to "yes",
-  # if you test playbook requires any.
+  # It is normally not needed to set "become" to "true" for a module test.
+  # Only set it to true if it is needed to execute commands as root.
   become: false
+  # Enable "gather_facts" only if "ansible_facts" variable needs to be used.
   gather_facts: false
 
   tasks:

utils/templates/test_module.yml.in

 ---
 - name: Test $name
   hosts: "{{ ipa_test_host | default('ipaserver') }}"
-  # Change "become" or "gather_facts" to "yes",
-  # if you test playbook requires any.
+  # It is normally not needed to set "become" to "true" for a module test.
+  # Only set it to true if it is needed to execute commands as root.
   become: false
+  # Enable "gather_facts" only if "ansible_facts" variable needs to be used.
   gather_facts: false
 
   tasks:

utils/templates/test_module_client_context.yml.in

 ---
 - name: Test ${name}
   hosts: ipaclients, ipaserver
-  # Change "become" or "gather_facts" to "yes",
-  # if you test playbook requires any.
+  # It is normally not needed to set "become" to "true" for a module test.
+  # Only set it to true if it is needed to execute commands as root.
   become: false
+  # Enable "gather_facts" only if "ansible_facts" variable needs to be used.
   gather_facts: false
 
   tasks: