ipahbacrule module fails to execute if hbacsvcgroup has uppercase letters.

Reproducer:

1. Given the playbook "hbac_reproducer.yml":

```
—

• name: ipahbacrule idempotence issue reproducer
  host: ipaserver
  become: false
  gather_facts: false

tasks:

• name: Ensure hbacsvcgroup Sudo is present.
  ipahbacsvcgroup:
  ipaadmin_password: SomeADMINpassword
  name: Sudo
  state: present

• name: Ensure hbacrule with hbacsvcgroup is present.
  ipahbacrule:
  ipaadmin_password: SomeADMINpassword
  name: reproducer
  hbacgroup: sudo

• name: Ensure hbacrule with hbacsvcgroup is present.
  ipahbacrule:
  ipaadmin_password: SomeADMINpassword
  name: reproducer
  hbacgroup: sudo
  ```

2. Execute the playbook against an IPA server:

$ ansible-playbook -i inventory hbac_reproducer.yml

3. The result will be that at least one of the 'ipahbacrule' modules will fail with message "hbacrule_add_service: hbacsvcgroup sudo: This entry is already a member".

Initial investigation:

By debugging the issue, one can see that the command in the task that succeeds is:

• ['all-users/sudo', 'hbacrule_add_service', {'hbacsvc': [], 'hbacsvcgroup': ['sudo']}

  ]]

And the commands in the task that fails are:

• ['all-users/sudo', 'hbacrule_add_service', {'hbacsvc': [], 'hbacsvcgroup': ['sudo']}

  ]

• ['all-users/sudo', 'hbacrule_remove_service', {'hbacsvc': [], 'hbacsvcgroup': ['Sudo']}

  ]