Import TripleO CI environments from tripleo-ci

Import TripleO CI environments from tripleo-ci

Import TripleO CI environments from tripleo-ci into THT for some
reasons:

1) THT is branched while tripleo-ci is not. Having them here would allow
   to make scenarios able to evolve over the releases without adding
   more scenarios.
2) Help our developers to run TripleO CI scenarios themselves from THT
   by exposing the templates here.

The whole discussion is here:
http://lists.openstack.org/pipermail/openstack-dev/2016-November/107816.html

Change-Id: I3527a64c0c8f56ca77115d32849fa23fe710112d