Merge "Add callback registration in ConnectivityService." am: 49c3b00b1a am: bbb915b13f

Change-Id: I88ab7b749860a0f94857743ba759bb47270857f6
tree: 8f98bf7db140029fdeb073bd2839b17fe33fdb73
  1. core/
  2. services/
  3. tests/