Deprecate unused Exceptions
Deprecate unused Exceptions

There are a lot of exceptions that seem to be unused in the
glance_store. This change deprecates all these unused exceptions.

Closes-Bug: 1516020
Change-Id: I58e69ddced3ca7fad0a9df8c7f52f5f5c077a844

openstack/glance_store,openstack/glance_store