Adding code to filter out slave SQL errors since these are checked by
the tests themselves.


mysql-test/lib/mtr_report.pl:
  Filtering out slave SQL errors since these are handled by the
  tests themselves.
mysql-test/suite/rpl/t/disabled.def:
  Enabling disabled tests.
mysql-test/suite/rpl_ndb/r/rpl_truncate_7ndb.result:
  Result change.
mysql-test/suite/rpl_ndb/t/disabled.def:
  Enabling disabled tests.