When at least one service named as q-* is present in ENABLED_SERVICES,
then devstack utilizes lib/neutron-legacy to configure services
regardless of how other services are deployed (e.g. with lib/neutron).
This breaks deployment using lib/neutron.
Switching to new names doesn't change anything substantial because
devstack plugin equally handles both variants. It allows to use new
devstack neutron library though.
Change-Id: Id0d35523651131766a70e78bf130205c1c63acd5
661247a617