Sync oslo threadgroup.py to fix wait & stop methods

Sync oslo threadgroup.py to 25ff65e955b7ef1091722224f7c71f14fc971354 so
we include the fix for bug #1196525, which resolves a problem where the
wait and stop methods would not actually wait for/stop all threads in
the thread group.

Change-Id: Ia49d7096180b2942cf49b1f0dacde3c5e933337c
oslo: update the remainder of the modules

Change-Id: I83796c1e1f2f69d2ce27e7180c4004a5f345f063
Remove unused variable badkeys

Since it's never used and consumed a set subtraction.

Change-Id: Ic2231ad5e491527c7f746172d9a3e07a6623b823
Merge "oslo: update the remainder of the modules"
Merge "Remove unused variable badkeys"
Merge "Sync oslo threadgroup.py to fix wait & stop methods"