some messages in exceptions.py are not setup for localization

[Amrith Kumar]

some messages in trove/common/exceptions.py are not setup for localization.

class NoServiceEndpoint(TroveError):
    """Could not find requested endpoint in Service Catalog."""
    message = ("Endpoint not found for service_type=%(service_type)s, "
               "endpoint_type=%(endpoint_type)s, "
               "endpoint_region=%(endpoint_region)s")

class EmptyCatalog(NoServiceEndpoint):
    """The service catalog is empty."""
    message = 'Empty catalog'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/101301

[OpenStack Infra (hudson-openstack)]

Change abandoned by amrith (<email address hidden>) on branch: master
Review: https://review.openstack.org/101301
Reason: trove audit logging for common module change https://review.openstack.org/#/c/103217/ took care of this change.