Comment 11 for bug 1402055

Checked the proposed fix, but this is not fixing the actual issue for EmptyCatalogue, rather its skipping the service catalogue, and using the single_remote_tenant.
To actually fix this issue, we need to use the Keystone Session while creating the TroveContext, and pass the actual auth_token, this will initialize the service_catalogue for Trove.
Similar approach is been used in openstack-heat project
https://github.com/openstack/heat/blob/master/heat/engine/clients/os/nova.py#L81