Sync service module from oslo-incubator

Previously we synced with oslo-incubator commit hash
caed79d8239679cb74476bb0d9e5011b4fcc39da.

This adds the service module from the same oslo hash.

The service module is required for bug 1157261.

Change-Id: I8c83901dadf52d64755328c70e3c2583b8c07026
Merge "Sync service module from oslo-incubator"