Makes non-admin job to use pre provisioned cred
Makes non-admin job to use pre provisioned cred

Now Devstack does not set the deprecated legacy creds on Tempest,
tests/jobs should use either dynamic or pre provisioned creds.

non-admin experimental/periodic job is also using the legacy cred.
Dynamic cred way would not work for non-admin as it need admin cred to
create the dynamic credentials.

This commit makes non-admin job to use pre provisioned creds.

Change-Id: I94231fe86ce3fef2ec0c78eb81301c66aaaa7f41

Tesora/tesora-project-config,dongwenjuan/project-config,noorul/os-project-config,openstack-infra/project-config,openstack-infra/project-config,dongwenjuan/project-config,noorul/os-project-config,Tesora/tesora-project-config