Run validation only if overcloud exists.

When no overcloud is deployed, the openstack-endpoint.yaml validations
fail. This patch re-orders couple of tasks and runs the failing task for
unavailable endpoints only when an overcloud exists.

Change-Id: I174b5a239a7c1ab7b93323654a417db8f087bc27
Story: #2002061
(cherry picked from commit 864ab1d64d)

validations/openstack-endpoints.yaml

@@ -12,16 +12,29 @@
       - pre-upgrade
       - post-upgrade
   tasks:
+  - name: Set fact to identify if the overcloud was deployed
+    set_fact:
+       overcloud_deployed: "{{ groups['overcloud'] is defined }}"
+
   # Check that the Horizon endpoint exists
   - name: Fail if the HorizonPublic endpoint is not defined
     fail: msg="The `HorizonPublic` endpoint is not defined in the `EndpointMap` of the deployed stack. This means Horizon may not have been deployed correctly."
-    when: overcloud_horizon_url|default('') == ''
+    when:
+      - overcloud_horizon_url|default('') == ''
+      - overcloud_deployed|bool
 
   # Check connectivity to horizon
   - name: Check Horizon
     uri: url={{ overcloud_horizon_url }}
     when: overcloud_horizon_url|default('')
 
+  # Check that the Keystone endpoint exists
+  - name: Fail if KeystoneURL output is not available
+    fail: msg="The `KeystoneURL` output is not available in the deployed stack."
+    when:
+      - overcloud_keystone_url|default('') == ''
+      - overcloud_deployed|bool
+
   # Check that we can obtain an auth token from horizon
   - name: Check Keystone
     uri:
@@ -44,8 +57,5 @@
     register: auth_token
     when: overcloud_keystone_url|default('')
 
-  - name: Fail if KeystoneURL output is not available
-    fail: msg="The `KeystoneURL` output is not available in the deployed stack."
-    when: overcloud_keystone_url|default('') == ''
 
 # TODO(shadower): other endpoints