Add initial spec file for oslo.concurrency
Add initial spec file for oslo.concurrency

* Re-written using new syntax
* Add lower bounds according to requirements
* Rebase

Co-Authored-by: Thomas Bechtold <146c0151a0e725bfeb02563a32ae78cab8c92198@suse.com>
Change-Id: I08c1aa5d61303ea60f39c6718ea1de46bc07cd93

openstack/rpm-packaging,openstack/rpm-packaging