Removing DBUG_DUMP printouts for valgrind builds since they trigger warnings.
Removing valgrind memory checks completely.
Removing bzero() of record when opening table that was added earlier.


sql/log_event.cc:
  Removing DBUG_DUMP of records for valgrind builds since they trigger false valgrind
  warnings.
  Removing valgrind checks completely, since they can trigger false valgrind warnings.
sql/sql_class.cc:
  Removing DBUG_DUMP of records for valgrind builds since they trigger false valgrind
  warnings.
sql/table.cc:
  Removing extreneous bzero() that were added previously.