Scrum task 845. Thi is a behaviour change :

now by default, FLUSH, OPTIMIZE, ANALYZE, REPAIR commands are written to the
binlog, unless the new NO_WRITE_TO_BINLOG keyword was used :
OPTIMIZE NO_WRITE_TO_BINLOG table t;

Previously these commands were never written to the binlog, but there are
2 reasons to change this :
- the RENAME TABLE in MERGE table bug (#175) on slave
- the possible "differently optimised queries may lead to different
updates on the master and slave" bug, until we have automatic ORDER BY.

FLUSH LOGS/SLAVE/MASTER/TABLES WITH READ LOCK are never written to the binlog.
New test for the new logging behaviour.
Other small change : reload_acl_and_cache() and reset_slave() don't send their errors themselves,
this is more usual.

mysql-test/mysql-test-run.sh

@@ -625,7 +625,9 @@ report_stats () {
     $RM -f $MY_LOG_DIR/warnings $MY_LOG_DIR/warnings.tmp
     # Remove some non fatal warnings from the log files
     $SED -e 's!Warning:  Table:.* on delete!!g' \
-         $MY_LOG_DIR/*.err > $MY_LOG_DIR/warnings.tmp
+        $MY_LOG_DIR/*.err \
+        | $SED -e 's!Warning:  Table:.* on rename!!g' \
+        > $MY_LOG_DIR/warnings.tmp
 
     found_error=0
     # Find errors