implement limitation with only on logfile group, since SR is really buggy with several


mysql-test/r/ndb_dd_ddl.result:
  Test that only 1 logfile group can be created
mysql-test/r/ndb_dd_dump.result:
  Test that only 1 logfile group can be created
mysql-test/t/ndb_dd_ddl.test:
  Test that only 1 logfile group can be created
mysql-test/t/ndb_dd_dump.test:
  Test that only 1 logfile group can be created
storage/ndb/include/kernel/signaldata/CreateFilegroupImpl.hpp:
  New error code for "only one logfile group" limitation
storage/ndb/src/kernel/blocks/lgman.cpp:
  New error code for "only one logfile group" limitation
storage/ndb/src/ndbapi/ndberror.c:
  New error code for "only one logfile group" limitation