Cleanups to VPN hostside tests.

Use TestableNetworkCallback instead of a hand-rolled class.
Remove unnecessary runWithShellPermissionIdentity around
unregisterNetworkCallback calls.

Bug: 165835257
Test: test-only change
Change-Id: I4557dfc64136f9c0b4bdaa1248c33b13e96ba3ed
1 file changed
tree: 1431e5bcd8f8d6a5c878cc25f7a315bbb94eb37c
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING