Add retries while Verify a FQDN is set

Due to some race condition, FQDN check is running before dnsmasq is returning FQDN for compute nodes. To avoid that, we want that this check should retry for couple of minutes until dnsmasq is ready and returns FQDN.

Ref: openstack-k8s-operators/architecture#595

Author: amartyasinha

roles/edpm_nodes_validation/tasks/main.yml

@@ -72,12 +72,13 @@
       ansible.builtin.command: hostname -f
       register: hostname
       changed_when: false
-
-    - name: Verify a FQDN is set
-      ansible.builtin.assert:
-        that: hostname.stdout.find(".") != -1
-        fail_msg: "{{ hostname.stdout }} does not contain . and does not appear to be an FQDN."
-        success_msg: "{{ hostname.stdout }} contains . and appears to be an FQDN."
+      retries: 5
+      delay: 60
+      until: hostname.stdout.find(".") != -1
+  rescue:
+    - name: Fail if hostname is not FQDN
+      ansible.builtin.fail:
+        msg: "{{ hostname.stdout }} does not contain . and does not appear to be an FQDN."
 
 - name: Verify the configured FQDN vs {{ edpm_nodes_validation_validate_fqdn_hosts_file }}
   ansible.builtin.shell: |