Exadata: Oracle Enterprise Manager shows Management Server is DOWN but ping shows SUCCESS

With MOS document "EXADATA:OEM errors MS Status is DOWN and Ping Status is SUCCESS" from note ID 2112971.1 we learn that in Exadata Cell server software 12.1.2.2.0 the ipconf utility restarts the Management Server and that since ipconf runs with Exachk the MS gets restarts every time you run Exachk!  Seems like a problem huh?  The good news is that cellsrv does not actually go down, so there is no service interruption, but this is something you may need to know for your next patch application!