Issue #555: Updated regex to validate the domain name

Signed-off-by: DeepikaKrishnaiah <deepika_k2@dell.com>

roles/cluster_validation/tasks/fetch_password.yml

@@ -132,7 +132,7 @@
 - name: Validate the domain name
   assert:
     that:
-      - domain_name is regex("^(?!-)[A-Za-z0-9-]+([\\-\\.]{1}[a-z0-9]+)*\\.[A-Za-z]{2,6}$")
+      - domain_name is regex("^(?!-)[A-Za-z0-9-]+([\\-\\.]{1}[a-z0-9]+)*\\.[A-Za-z]{2,}$")
     success_msg: "{{ domain_name_success_msg }}"
     fail_msg: "{{ domain_name_fail_msg }}"
   when: login_node_required
@@ -140,7 +140,7 @@
 - name: Validate the realm name
   assert:
     that:
-      - realm_name is regex("^(?!-)[A-Z0-9-]+([\\-\\.]{1}[a-z0-9]+)*\\.[A-Z]{2,6}$")
+      - realm_name is regex("^(?!-)[A-Z0-9-]+([\\-\\.]{1}[a-z0-9]+)*\\.[A-Z]{2,}$")
       - '"." in realm_name'
     success_msg: "{{ realm_name_success_msg }}"
     fail_msg: "{{ realm_name_fail_msg }}"
@@ -176,4 +176,4 @@
   command: >-
     ansible-vault encrypt {{ role_path }}/../../{{ config_filename }}
     --vault-password-file {{ role_path }}/../../{{ config_vaultname }}
-  changed_when: false
+  changed_when: false