Update oslo.context to 2.9.0 (2nd try)
Update oslo.context to 2.9.0 (2nd try)

Commit 60a25f6b8a30fd didn't update the Version field.
Also fix indent

Change-Id: I4946e8af0e630785f91d599bb4eea39c26f0d72d

openstack/rpm-packaging,openstack/rpm-packaging