Clean up comment about dual-stack case handling
Clean up comment about dual-stack case handling

Change-Id: I3070664c87e6e5e8c0e579e68ca12faae8f441ed

Tesora/tesora-tempest,bigswitch/tempest,masayukig/tempest,vedujoshi/tempest,LIS/lis-tempest,Juniper/tempest,masayukig/tempest,zsoltdudas/lis-tempest,cisco-openstack/tempest,bigswitch/tempest,sebrandon1/tempest,vedujoshi/tempest,LIS/lis-tempest,Juniper/tempest,Tesora/tesora-tempest,cisco-openstack/tempest,openstack/tempest,openstack/tempest,zsoltdudas/lis-tempest,sebrandon1/tempest