Merge "Add network disconnected callback" am: c1657fb7f8

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1652259

Change-Id: I75bd112821c42c16d7ed91ecbb4f21104c95204b
tree: 190ffee47f8aa51d87357b08cf546f7f3f6f2aa9
  1. framework/
  2. service/
  3. OWNERS
  4. TEST_MAPPING