Move applying underlying caps from Vpn to ConnectivityService. am: 220987b38d am: a27c332849 am: ed3589c104

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1501815

Change-Id: I924998ffa45ba630d8688007878f339264e7108e
tree: aa2884b97d14f1153413c826be9719168b8ad12b
  1. core/
  2. services/
  3. tests/