Merge "Add IFF_MULTICAST to test interfaces" am: aa5532cb6f am: e90ceefb34 am: c25fd004f7 am: 13a6b19c4a am: e38a5fc8ca

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

Change-Id: Ie95f6b5f3453e7e610f4697ab08b1bd9b10f5e3a