Updated openstack/openstack
Project: openstack/oslo-incubator  8b833185e378fa221d81c3e3ff37b644ea4fb49e

Delete graduated concurrency files

Per the new process, we will not be keeping graduated files around
on the master branch of incubator.

Co-Authored-By: Ihar Hrachyshka <ihrachys@redhat.com>
Change-Id: Id0469b31a51ee6482d8b7bcca7664854d705c102
Closes-Bug: 1371697