To cover the case when Nuage VSD & VSC are deployed outside of juju
framework.
Removed nuage-tarball from config file
Removed respective code form neutron_api_hook.py
Change-Id: I4518435ded9e1a4eb3d98cbb2e77f04b4f2dda61
Signed-off-by: sunny-verma <sunnyverma1992@gmail.com>