controller_public_protocol not set

[Mark T. Voelker]

Change-Id: I49c751a8b68a49e6f15c4e213c0ddbbec7076229 created a data
mapping for the protocol used to access API services on the
control node. However it didn't set that variable in a hiera_data/*
file, which can lead to errors during puppet runs due to required
variables being missing:

Warning: data_mapping key: glance::keystone::auth::public_protocol maps to controller_public_protocol which is not found in hiera data. This may not be an issue, b/c the class glance::keystone::auth is not included.
Warning: data_mapping key: keystone::endpoint::public_protocol maps to controller_public_protocol which is not found in hiera data. This may not be an issue, b/c the class keystone::endpoint is not included.
Warning: data_mapping key: cinder::keystone::auth::public_protocol maps to controller_public_protocol which is not found in hiera data. This may not be an issue, b/c the class cinder::keystone::auth is not included.
Error: Could not run: data mapping controller_public_protocol not found. Failing b/c it is required for class ceilometer::keystone::auth

To fix this, we need to set up $controller_public_protocol in user.common.yaml and default it to http.

[Mark T. Voelker (mvoelker)]

Fix:
https://review.openstack.org/76914