This passed CI only because we are doing this in tripleo.sh[1].
We need to remove the pin in tripleo.sh (or at least make it
conditional on release) if we remove the "user-facing" pin.
As is, the tripleoclient image commands are broken for anyone
not using tripleo.sh.
[1] https://git.openstack.org/cgit/openstack-infra/tripleo-ci/tree/scripts/tripleo.sh?id=49b00c54cdb2525e50cbea9d12881167eecf198f#n161
Closes-Bug: 1631052
This reverts commit b2e5648fda.
Change-Id: I28b7130ac10c3220786c198945cae16406442b14