Merge "Split NetworkStackUtils to frameworks/libs/net" am: 3c141ccc37 am: b2106a8710 am: b94d8e59c9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1515150

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie7e0d275ebeaec5d14f89a789f2dcdf01b9d1b6c