Replace runWithScissors with a custom implementation. am: 6339ef0b4e

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1955878

Change-Id: I5f3b680852d6244e2dcef2af07f0308d998a859b
tree: 9cf0227e055567a2bdeac12e9b9e9af27cddbcc8
  1. service-t/
  2. tests/