Remove trove as default value for Service Name

* This causes service catalog lookup issues when the Catalog
  contains service_type = database, but service_name = somethine_else

fixes bug 1228372

Change-Id: I1f7eebb06d7f57c0ecc95d8c05104f43e803c406
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.

implements blueprint cli-compliance-upgrade

Change-Id: Ie69d9dbc75ce90496da316244c97acca1877a327