Rename quantum to neutron

See: https://wiki.openstack.org/wiki/Network/neutron-renaming

Change-Id: If1bc26259a2a3e79012b63fe33af50372f7f2b43
Reviewed-on: https://review.openstack.org/35853
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: James E. Blair <corvus@inaugust.com>