Report oslo commits in #openstack-nova.

Nova makes heavy use of Oslo code, so report oslo commits in the nova
channel.

Change-Id: I5553fe9d42eb361ae2a43dfdf67456cf637d13d6
Reviewed-on: https://review.openstack.org/29291
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins