Merge "Add test coverage for NetworkStats.Bucket#getRoaming()" am: 23f5e54efa am: b3d3f43942

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2017915

Change-Id: Ib6c321ab07486d145d1a79cc641c6947bdf678c5