[automerger skipped] Merge "Rename IDhcpLeaseCallbacks to IDhcpEventCallbacks for more generic." into rvc-dev am: 210adac5fa -s ours

am skip reason: Change-Id I66614fbf67fba1e7dab0b8a2d41bc30a726e4f38 with SHA-1 49889dd4c0 is in history

Change-Id: Ifdedc3ae90e7bf4aeb9970cdd4b04cecdf625e19