removed grep event and added congestion event
   more docs
    changed some naming, expecially regarding severities
    added config param for logevel for congestion


mysql-test/ndb/basic.result:
  updated ndb_mgm test
mysql-test/ndb/restart.test:
  updated ndb_mgm test
ndb/include/kernel/LogLevel.hpp:
  removed grep event and added congestion event
ndb/include/mgmapi/mgmapi.h:
  more docs
  changed some naming, expecially regarding severities
ndb/include/mgmapi/mgmapi_config_parameters.h:
  removed grep event and added congestion event
ndb/src/common/debugger/EventLogger.cpp:
  removed grep event and added congestion event
ndb/src/mgmapi/mgmapi.cpp:
  changed some naming, expecially regarding severities
ndb/src/mgmsrv/ConfigInfo.cpp:
  added config param for logevel for congestion
ndb/src/mgmsrv/Services.cpp:
  just som variable name changes