- Better error message when table definition has changed


mysql-test/r/ndb_alter_table.result:
  New error message and code when table definition has changed.
mysql-test/r/ndb_multi.result:
  Safety, drop tables in second server as well
mysql-test/t/ndb_alter_table.test:
  New error message and code when table definition has changed.
mysql-test/t/ndb_multi.test:
  Safety, drop tables in second server as well
sql/ha_ndbcluster.cc:
  When error 284 is returned from NDB a check must be made to see what the error really means.
   - if table does not exists any more, return 709 -> No such table exists
   - if table still exists, table has most likely been altered and table id and version has 
     changed, print  hardcoded  errormessage indicating that transaction should retried
    (this error message should be translated to a langauge dependent error message in 5.0)
    
  Remove mapping from 284 to HA_ERR_NO_SUCH_TABLE

Added test for cache in combination with multiple MySQL Servers


mysql-test/include/have_ndb.inc:
  Added suport for connecting to two MySQL Server instances
  (I hope this will work on all platforms, since it does not use the socket parameter when openeing the connections, analog to how it looks like in replication tests)