Update devstack to work with new split neutron services repos

This commit udpates devstack to work with the latest neutron services, which
are now in their own repositories. This will also unblock third party CI for
services testing. This also allows devstack users to run neutron with
services again.

Change-Id: I9cdd51f09edaccf218988240b48ce733d5771a65
add shebang lines to all lib files

With gerrit 2.8, and the new change screen, this will trigger syntax
highlighting in gerrit. Thus making reviewing code a lot nicer.

Change-Id: Id238748417ffab53e02d59413dba66f61e724383
Merge "add shebang lines to all lib files"
Merge "Update devstack to work with new split neutron services repos"
Merge branch 'master' of https://github.com/openstack-dev/devstack