Add tempest-dsvm-postgres-full into the integrated gate

Just about every integrated project supports postgres (except swift),
but until now it wasn't part of the integrated-gate this means a
postgres breaking patch can be landed in the gate. This happened in heat
as documented by the bug below.

The integated-gate template is used on 35 repos while this patch removes
gate-tempest-dsvm-postgres in 20 places, so this patch adds a new gating
job to 15 repos.

Change-Id: Ieb1f162f9812917159314d328dde4f6c81f33e4c
Related-Bug: #1321093
Merge "Add tempest-dsvm-postgres-full into the integrated gate"