Merge "Add IFF_MULTICAST to test interfaces" am: aa5532cb6f am: e90ceefb34 am: c25fd004f7 am: 13a6b19c4a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1856105

Change-Id: I64371ac1ce82846947dd6d2386f5d658bfb6d50a