Update oslo-incubator import.

These are all minor changes bringing nova up to commit
90e83530d4dc49d570fa05ea63a93805717dcfa0 in oslo-incubator.

Change-Id: I0291eed31b1e650da211fe2a8b65fad0c35c9053
Update our import of oslo's processutils.

I've just synced nova's processutils back to oslo and this is now
the sync back in the other direction.

Change-Id: I8389bdd85ed3dacbb02aec043dfd0f84ef07b18b
Merge "Update oslo-incubator import."
Merge "Update our import of oslo's processutils."
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp