Add a test for getDefaultNetworkCapabilitiesForUser. am: 6f7a5df35a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13425316

Change-Id: Ic3b3584c25a0703aa273b47d042b2b339f1de2e7
tree: 844d0ed8e2471f3383bfb33d63c2b0008842d034
  1. core/
  2. services/
  3. tests/