ipahbacrule: Fix handling of hbacsvcgroup in members

FreeIPA provides a default hbacsvcgroup named "Sudo", with capital 'S',
that is different from every other hbacsvcgroup, which are all
represented by lower case letters.

As data from IPA API was not modified, this causes an idempotence error
when using different capitalization with the 'hbacsvcgroup' parameter.

This patch fixes the issue by using the CaseInsensitive comparator to
create the hbacsvcgroup list.

Tests were update to make sure a regression is not included in the
future.

tests/hbacrule/test_hbacrule_member_case_insensitive.yml

@@ -468,11 +468,51 @@
         register: result
         failed_when: result.changed or result.failed
 
+      # Specifically test 'Sudo', as FreeIPA adds a "Sudo" hbacsvcgroup instead of "sudo"
+      - name: Ensure 'sudo' works as hbacsvcgroup.
+        ipahbacrule:
+          ipaadmin_password: SomeADMINpassword
+          name: "test_sudo"
+          hbacsvcgroup:
+          - sudo
+        register: result
+        failed_when: not result.changed or result.failed
+
+      - name: Ensure 'sudo' works as hbacsvcgroup, again.
+        ipahbacrule:
+          ipaadmin_password: SomeADMINpassword
+          name: "test_sudo"
+          hbacsvcgroup:
+          - sudo
+        register: result
+        failed_when: result.changed or result.failed
+
+      - name: Ensure 'sudo' works as hbacsvcgroup, action member.
+        ipahbacrule:
+          ipaadmin_password: SomeADMINpassword
+          name: "test_sudo"
+          hbacsvcgroup:
+          - sudo
+          action: member
+        register: result
+        failed_when: result.changed or result.failed
+
+      - name: Ensure 'Sudo' works as hbacsvcgroup, action member.
+        ipahbacrule:
+          ipaadmin_password: SomeADMINpassword
+          name: "test_sudo"
+          hbacsvcgroup:
+          - Sudo
+        register: result
+        failed_when: result.changed or result.failed
+
     always:
       - name: Ensure test hbacrule is absent
         ipahbacrule:
           ipaadmin_password: SomeADMINpassword
-          name: testrule
+          name:
+            - testrule
+            - test_sudo
           state: absent
 
       - name: Ensure test users are absent