Change I52ee4b345b0a4b262e330a9a89552cd216eafdbe added a workaround
that has been addressed in oslo.messaging by change
If82c2175cf7242b80509d180cdf92323c0f4c43b so remove the workaround
and increase the min for oslo.messaging in the cinder requirements
to the first release containing the fix.
Change-Id: Ib9e8c28804cc7c67bfdfb438dc3da06f25046b81