Branch b1_6

b=14321
o=Brian Behlendorf(behlendorf1@llnl.gov)
i=bobijam
i=shadow

Description: lustre_mgs: operation 101 on unconnected MGS
Details    : When MGC is disconnected from MGS long enough, MGS will evict the
             MGC, and late on MGC cannot successfully connect to MGS and a lot
             of the error messages complaining that MGS is not connected.