Ensure that NetworkCallbacks and netd operations are accounted for. Also add a test for the spurious onLinkPropertiesChanged callback that is currently send out after onLost. Bug: 176496580 Test: atest ConnectivityServiceTest Original-Change: https://android-review.googlesource.com/1729093 Merged-In: I69cf58bc87dfe55ea359a2cd76167d03fe2c953d Change-Id: I69cf58bc87dfe55ea359a2cd76167d03fe2c953d