Add Tripleo CI user.

This will permit Tripleo CI to obtain IPs from neutron in
ci-overcloud.tripleo.org(the ci overcloud). Once merged the user will
need to be added manually to the ci-overcloud, this should eventually be
automated and persisted when we move to the cd-overcloud.

Change-Id: I9c312fdc71895544ed34bfe4c3abf6aa5a2ea4ef
Merge "Add Tripleo CI user."