We get deprecation warnings from ansible about use
of python2 on xenial hosts. Rather than setting
ansible_python_interpreter to python3 on a host by
host basis, set it globally to python3.
Set it to python for the one host that's too old,
refstack.openstack.org, which is running on trusty
which only has python3.4.
Change-Id: I4965d950c13efad80d72912911bc7099e9da1659
We need to override this because it's erroneously picking up
python2 which on etherpad does not have everything it needs.
Change-Id: Ic127f505740f9ac66abb8754356e04acde66dd85
Upstream likes building the settings file into the image, but that's
less exciting, let's bind-mount ours in.
Depends-On: https://review.opendev.org/717491/
Change-Id: Ia1894d884ef2a84e1282345b77fe07bf8898f367