tests/sudorule: Don't become or gather_facts and use only true/false

Unless there's a real need to use privileged access or to gather Ansible
facts upfront, we should always set "become: false" and
"gather_facts: false". In the case that only a few Ansible facts are
required, 'ansible.builtin.setup' with 'gather_subset' should be used.

As the YAML 1.2 standard dictates, boolean values should only use 'true'
or 'false' values.

This patch fixes these issues in the 'sudorule' test suite.

tests/sudorule/test_sudorule.yml

@@ -3,11 +3,15 @@
 - name: Test sudorule
   hosts: "{{ ipa_test_host | default('ipaserver') }}"
   become: true
-  gather_facts: true
+  gather_facts: false
 
   tasks:
 
   # setup
+  - name: Ensure DNS Ansible facts are available
+    ansible.builtin.setup:
+      gather_subset: dns
+
   - name: Ensure test user is present
     ipauser:
       ipaadmin_password: SomeADMINpassword
@@ -1157,7 +1161,7 @@
       hostmask: 192.168.120.0/24
       action: member
     register: result
-    check_mode: yes
+    check_mode: true
     failed_when: not result.changed or result.failed
 
   - name: Ensure sudorule hostmask member is present