Update location of dynamic creds in tempest tests

Tempest is migrating their dynamic credentials interface to tempest
lib as part of the effort to create stable interfaces. [0] We will
need to update its location in our code to conform with it.

[0] http://lists.openstack.org/pipermail/openstack-dev/2017-July/119934.html

Depends-On: Id8d60e4d7c22bc72c3e48bc768509ff0cc0c89d5

Change-Id: Iaa6bf908ff5d63cbbfddc7060594818c66ce607c
1 file changed
tree: eed919704808f2970fe65b5308595cc147add86c
  1. manila_tempest_tests/