Summary: See discussion in D19379. The 4-tuple of (device, network, address, port) should be unique. Test Plan: Created lots of duplicate interfaces, bound those interfaces to various services, observed migration script clean things up correctly. Reviewers: epriestley Reviewed By: epriestley Subscribers: Korvin, PHID-OPKG-gm6ozazyms6q6i22gyam Differential Revision: https://secure.phabricator.com/D19388