Quote openshift_release in example inventory.

inventory/hosts.example

@@ -51,7 +51,7 @@ openshift_deployment_type=origin
 # use this to lookup the latest exact version of the container images, which is the tag actually used to configure
 # the cluster. For RPM installations we just verify the version detected in your configured repos matches this
 # release.
-openshift_release=v3.9
+openshift_release="3.9"
 
 # default subdomain to use for exposed routes, you should have wildcard dns
 # for *.apps.test.example.com that points at your infra nodes which will run

roles/openshift_sanitize_inventory/tasks/main.yml

@@ -26,7 +26,7 @@
   fail:
     msg: |-
       openshift_release is "{{ openshift_release }}" which is not a valid version string.
-      Please set it to a version string like "3.4".
+      Please set openshift_release to a version string and ensure that the value is quoted, ex: openshift_release="3.4".
 
 - include_tasks: unsupported.yml
   when: