cinderclient no longer honors --endpoint-type
cinderclient no longer honors --endpoint-type

Commit for "Enable version discovery":
ae03d2a721bd9acb61805ce792a27fb7cf88e5cd
breaks CLI use of --endpoint-type. This is because we were using the
default interface instead of checking to see if an endpoint_type is
passed in.

Change-Id: I412bb6b4bcb9bf10aa6118a2ed43e28cbd3ed236
Closes-Bug: 1454407

scottdangelo/cinderclient-api-microversions,scottdangelo/cinderclient-api-microversions