Merge "Move BitUtils, RingBuffer test to coretests" am: 6be4ebcb0a am: b65aea1772 am: 5f01d1d538

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1754897

Change-Id: I8ee423093f763ecb8ca15211f56ae83885c0eab9