Merge "Add IFF_MULTICAST to test interfaces" am: aa5532cb6f am: e90ceefb34 am: f543cd65dc

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

Change-Id: I4aebe6eed322cda4e63c6fb51e60597403ebb81b