Add python3 enabled packages to stein-py3-uc tag
Add python3 enabled packages to stein-py3-uc tag

specs have been converted to python3 in several packages
so we can add them to stein-py3-uc tag:

- nova: converted in https://review.rdoproject.org/r/16368
- cinder: converted in https://review.rdoproject.org/r/16359
- neutron: converted in https://review.rdoproject.org/r/16366
- panko: converted in https://review.rdoproject.org/r/16373
- trove: converted in https://review.rdoproject.org/r/16426
- manila: converted in https://review.rdoproject.org/r/16382
- zaqar: converted in https://review.rdoproject.org/r/16424
- barbican: converted in https://review.rdoproject.org/r/16391
- ec2-api: converted in https://review.rdoproject.org/r/16430
- ceilometerclient: deprecated but still used by vitrage
- ceilometermiddleware: converted in https://review.rdoproject.org/r/16445
- packstack: converted in https://review.rdoproject.org/r/16462
- dracclient: converted in https://review.rdoproject.org/r/16476
- kolla: converted in https://review.rdoproject.org/r/16473
- kuryr-kubernetes: converted in https://review.rdoproject.org/r/16470
- heat-translator: spec was ready but not added to the tag

Change-Id: I49215fb8b479125b0fa407082f5a37a40399469d

javierpena/rdoinfo,redhat-openstack/rdoinfo