Pass neutron vars file to enable_pg_extensions
Pass neutron vars file to enable_pg_extensions

This is to avoid failures when we dont define the
neutron_plumgrid_pip_packages in a user file.

Signed-off-by: Javeria Khan <09d287669e47feb54c0cb63e33022fc8a1434dfe@plumgrid.com>

plumgrid/plumgrid-ansible