1) make sure that check_multi_node_shutdown does not proceed (in stop case)
  2) Fix printout


ndb/src/kernel/blocks/qmgr/Qmgr.hpp:
  make sure that check_multi_node_shutdown does not proceed (in stop case)
ndb/src/kernel/blocks/qmgr/QmgrMain.cpp:
  make sure that check_multi_node_shutdown does not proceed (in stop case)