Fixing doc for oc_adm_ca_server_cert.

roles/lib_openshift/library/oc_adm_ca_server_cert.py

@@ -120,9 +120,9 @@ options:
     aliases: []
   hostnames:
     description:
-    - Every hostname or IP that server certs should be valid for (comma-delimited list)
+    - Every hostname or IP that server certs should be valid for
     required: false
-    default: None
+    default: []
     aliases: []
   backup:
     description:

roles/lib_openshift/src/doc/ca_server_cert

@@ -69,9 +69,9 @@ options:
     aliases: []
   hostnames:
     description:
-    - Every hostname or IP that server certs should be valid for (comma-delimited list)
+    - Every hostname or IP that server certs should be valid for
     required: false
-    default: None
+    default: []
     aliases: []
   backup:
     description: