Reload NetworkManager on DNS config change

Initial fix [1] was not reloading NetworkManager config, which caused
MichaelRigart.interfaces role to clean up resolv.conf after interface
bounce.

[1] https://review.opendev.org/c/openstack/kayobe/+/902561
Related-Bug: #2044537

Change-Id: I5644ab2595a30cfff82f03d5ca4aa501a8b36ef8

ansible/roles/network-redhat/tasks/main.yml

@@ -19,6 +19,15 @@
       value: unmanaged
   when:
     - ansible_facts.os_family == "RedHat" and ansible_facts.distribution_major_version == "9"
+  register: dns_config_task
+
+- name: Reload NetworkManager with DNS config
+  become: true
+  systemd:
+    name: NetworkManager
+    state: reloaded
+    daemon_reload: yes
+  when: dns_config_task is changed
 
 - name: Configure network interfaces (RedHat)
   import_role: