skip security-groups if bsn l3 service plugin is not enabled
skip security-groups if bsn l3 service plugin is not enabled

Change-Id: I483c9dc7412d14586fc9b9587642eea0d33d0936

stackforge/networking-bigswitch,wolverineav/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,openstack/networking-bigswitch,stackforge/networking-bigswitch