This groups them together with the rest of the networking unit
tests. It also speeds up compile/test cycles ("runtest -x" of one
file goes from 1m15s to 30s).
Test: runtest frameworks-net passes on internal tree
Change-Id: I53cb0c51355fe4b4b30e451fa09fbbf58da39efd
This will give us a good place to put all the networking tests.
Fix: 31479480
Test: adb shell am instrument -w -e notClass com.android.server.connectivity.tethering.TetherInterfaceStateMachineTest 'com.android.frameworks.tests.net/android.support.test.runner.AndroidJUnitRunner' # PASS
(cherry picked from commit ecc986d430f4b8158f177ed97d2edb741f11ff71)
Change-Id: I4c417c2ba0747d2085169e47ae4a99e93c4d8814
