If the required keystone service for a given resource does
not exist in the keystone catalog, raises
StackResourceUnavailable.
It will be effective only if default_client_name is defined
in the given resource.
It also fixes other test cases, where is_service_available
needs to be returning True
implements blueprint keystone-based-resource-availability
Closes-bug: #1388047
Change-Id: I92afa9ffc3a3333b46dc25921cf7f982777cba76
490c36f7d0