Merge changes from topic "connectivity-diagnostics-system-server"

* changes:
  Add ConnectivityDiagnosticsManager to System Server.
  Make DataStallReport Parcelable.
  Make ConnectivityReport Parcelable.
tree: 7c886845053383fd8452f0a00fb18c160e228a08
  1. core/
  2. services/
  3. tests/