For various reasone have a partitioned cluster been created
  This patch makes sure that when they connect
  1) it's detected
  2) shutdown is forced


ndb/src/kernel/blocks/cmvmi/Cmvmi.cpp:
  New dump/error insert for simulating network failure
ndb/src/kernel/blocks/qmgr/Qmgr.hpp:
  1) Activly detect paritioned cluster(s)
  2) add some documentation
ndb/src/kernel/blocks/qmgr/QmgrMain.cpp:
  1) Activly detect paritioned cluster(s)
  2) add some documentation