Not all clients used their v3 version, so this patch adds
usage of them.
Endpoint URL addresses can have different format so the patch
edits parsing of them.
When a user exists, tempestconf will inform that a new user was not created,
but will not update it's password anymore. This can be done manually through
the openstack API.
Co-Authored-By: Arx Cruz <arxcruz@redhat.com>
Change-Id: I1f37c29fff0704f58d2179668e5f78ee459d2d61