Adding oslo.concurrency to requirements
Adding oslo.concurrency to requirements

oslo.service requires an unbounded version of oslo.concurrency and that causes
an issue with the agent since it wants a version of oslo.config that differs
from what the current version of oslo.concurrency wants.

Change-Id: Ic99204f9b23430a477905ca99897e69ee20ed5ad

openstack/python-monascaclient,stackforge/python-monascaclient,sapcc/python-monascaclient,sapcc/python-monascaclient,openstack/python-monascaclient,stackforge/python-monascaclient