Massive refactoring to the troveclient

The new client adheres to the standards of the other clients
now. It prints out tables, uses ENVVAR's for auth, no longer
stores pickled json in a login token, uses openstack common,
and moves the cli operations into a v1 module for the future
of trove when it has a v2 api.

Please note for compatibility, the troveclient.compat module
has the old cli. In order to deploy it, amend the setup.cfg
to include the compat module.

implements blueprint cli-compliance-upgrade

Change-Id: Ie69d9dbc75ce90496da316244c97acca1877a327