Revert "set binlog_format='ROW' if (gmysql-)innodb-read-committed is enabled"
"set binlog_format='ROW' requires SUPER privilege

This reverts commit 817975345de3127aeb4e25bc52b2dc38577d29b3.
add testsdir to diff output in start-test-stop
Merge pull request #1209 from mind04/mysql

revert set binlog and fix diff output in regression tests