update config.yaml, move most global config out

This commit updates config.yaml remove the global
puppet config.

It requires the following commit on the
scenario node terminus

  5ba0f92453aa4d4eaf75d68badff421a39573c47

The motivation is to allow scenarios to set
config defaults (i.e.: 13_role_ha, sets glance_backend
to swift), and to still allow those defaults to
be overridden.