BUG#13684: post push fix for test case.

      
The test case relies on binlog entries for assertion. The problem is that the
binlog does not get cleaned in pushbuild between tests, resulting in extra
entries in the result file, causing the test to fail.
      
This fix adds a reset master at the beginning of the test, so that we get a
clean binlog file.

mysql-test/suite/rpl/r/rpl_drop_if_exists.result

+RESET MASTER;
 DROP PROCEDURE IF EXISTS db_bug_13684.p;
 DROP FUNCTION IF EXISTS db_bug_13684.f;
 DROP TRIGGER IF EXISTS db_bug_13684.tr;

mysql-test/suite/rpl/t/rpl_drop_if_exists.test

@@ -40,6 +40,7 @@
 #  http://dev.mysql.com/doc/refman/5.1/en/sql-syntax-data-definition.html
 #
 --source include/have_log_bin.inc
+RESET MASTER;
 
 disable_warnings;