Move net-test-utils to its own directory

Having the test targets in a different directory allows setting
visibility rules for tests only, which is necessary for access to
targets that should not be used for device builds.

Bug: 182859030
Test: m
Change-Id: Iaf426cf339a97833acf80c941db692329c6e2dcb
30 files changed
tree: 1005b88fd25d9b375f5c9b5fc73f60342a88beb3
  1. staticlibs/