Sprinkle in more USE_IRONIC to TripleO jobs

TripleO is looking at switching the default of the USE_IRONIC
environment variable from 0 to 1, which means we should also
set it for all jobs, so that when the default changes it doesn't
cause other side effects.

Change-Id: Ifc7c77da2699cae735fc3c2bab452d97d4407941
Merge "Sprinkle in more USE_IRONIC to TripleO jobs"