Change ConnectivityServiceTest to prepare for VPN code move.

No-op changes to make it easier to review the VPN code move.
1. Set underlying networks via MockVpn, not ConnectivityService.
2. Add a processBroadcastForVpn utility method that we can modify
   without too much churn when the code is moved.

Bug: 173331190
Test: test-only change
Change-Id: I4256ca5f33034ef9d1de79857795a6ed1d644e61
1 file changed
tree: d4ed9dc06221d158460da9efc8574b8ea2b1f920
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS