Implement error reporting to Logger and associated classes.


ndb/include/logger/LogHandler.hpp:
  Add error string to LogHandler along with error code
ndb/include/logger/Logger.hpp:
  Add reporting back of error to addHandler(BaseString).
ndb/src/common/logger/FileLogHandler.cpp:
  Implement error reporting
ndb/src/common/logger/LogHandler.cpp:
  Implement error reporting.
  
  Trim spaces and tabs out of parameter names. This allows "p=v, param=value"
ndb/src/common/logger/Logger.cpp:
  Report back errors when adding a handler via BaseString
ndb/src/common/logger/SysLogHandler.cpp:
  Report an error on invalid syslog facility
ndb/src/mgmsrv/MgmtSrvr.cpp:
  Report error when adding log handler