Merge changes from topic "peruidcallback-cts"

* changes:
  Cleanups to VPN hostside tests.
  Ensure the HostsideVpnTests passes with keyguard locked.
  Add CTS tests for registerDefaultNetworkCallbackAsUid.
tree: fc5a8622fa9c67ad654e3965fb84d9852466ed3f
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING