Bug 1352511: allow duplicate instance-ip object for ports owned by routers

Change-Id: I4eab7aebd8da425d7a2a64068f0b7d61d835d829
(cherry picked from commit a27149e43be4de2643dda4a2d24d21012288230a)
Merge "Bug 1352511: allow duplicate instance-ip object for ports owned by routers"