Tagging of TripleO jobs should be tripleo-ptl

Members of tripleo-ptl group must be able to release
tripleo-heat-templates. It's the last project for which
group name was set up incorrectly.

Related change I45bc0b8c2e527af241c3bfa1bd5980ff2ba1f770.

Change-Id: Ied69765f1da8d933f594aa3fdbf696a8aa542570