tree 3b2b8f22ebc7e1d5c28534813234a5122944ac97
parent 08803f64e68a05c2b73367aded5de088a47769a7
author Sean M. Collins <sean_collins2@cable.comcast.com> 1418233077 -0700
committer Sean M. Collins <sean_collins2@cable.comcast.com> 1418233539 -0700

Use assertIn to check for subnet membership

For dual stacked networks, the gateway port will have multiple subnets
associated

Change-Id: I450f896f29051921b011e1643f1a1e24ed82ac08