reset master first in test to get consistent start

mysql-test/r/mysqlbinlog.result

+reset master;
 set timestamp=1000000000;
 drop table if exists t1,t2,t3,t4,t5,t03,t04;
 create table t1 (word varchar(20));

mysql-test/t/mysqlbinlog.test

@@ -4,6 +4,9 @@
 
 -- source include/have_log_bin.inc
 
+# Deletes all the binary logs
+reset master;
+
 # we need this for getting fixed timestamps inside of this test
 set timestamp=1000000000;