Updated openstack/openstack
Project: openstack/tempest  0450a604e6a642cc1e2c373beeba16c3a36b3ebf

Add a new credential provider to use a list of creds

This commit adds a new credential provider to use credentials provided
from a list of available credentials.

Partially implements bp test-accounts
Change-Id: I69c3105f8b413102ea567ccb92965572ce03d679