This change removes instack-undercloud from the image building process
by leveraging the newer elements that have been moved from
instack-undercloud into tripleo-puppet-elements
Change-Id: I9e9ccdf4371dcc5b399b9b83b0f4dafb7a428feb
Depends-On: I1de0b6421ef455ef58c0146da7fe52c35682b395
Related-Blueprint: remove-instack-undercloud