The bug happened because filtering-out a STMT_END_F-flagged event so that
the transaction COMMIT finds traces of incomplete statement commit.
Such situation is only possible with ndb circular replication. The filtered-out
rows event is one that immediately preceeds the COMMIT query event.
      
Fixed with deploying an the rows-log-event statement commit at executing
of the transaction COMMIT event. 
Resources that were allocated by other than STMT_END_F-flagged event of
the last statement are clean up prior execution of the commit logics.


mysql-test/suite/rpl_ndb/t/disabled.def:
  re-enabling two tests.
sql/log_event.cc:
  Adding the statement cleanup to execute at the transaction commit time.
  The statement might not be ended with execution of STMT_END_F-flagged event because of
  the event was filtered out by SERVER_ID rules.
  Small refactoring for Rows_log_event::do_update_pos() to be split on two parts:
  the statement commit that releases its execution time allocated resources, and
  the relay log update.