Merge "IpManager,DhcpClient: catch some errors and better logging" into nyc-dev
am: 5486aabc74

* commit '5486aabc747501da868985a9df5e4d24d2395fda':
  IpManager,DhcpClient: catch some errors and better logging

Change-Id: I6f61c3bb55124355188dafe7370406c06720b6f9