add the src lib forward testing to all of oslo

This gives all the oslo projects a job where they test their current
git against a devstack where all the rest of the libraries are at
release versions, but the server projects are at current head. It lets
an oslo library ensure that it's not going to ruin the world when it
releases.

Change-Id: I674dfa571d11ab810a3e6ba8146fbc75ea5da6f2
Merge "add the src lib forward testing to all of oslo"