Bug#46010 main.ctype_gbk_binlog fails sporadically : Table 't2' already exists

This test case uses mysqlbinlog to dump the content of master-bin.000001,
but the content of master-bin.000001 is not that this test needs.

MTR runs a lot of test cases on one server, so when this test starts, the current binlog file
might not be master-bin.000001, or there are other events are written by tests before.
'RESET MASTER' command must be called at the begin, it ensures that binlog of this test
is wrote to master-bin.000001 correctly.  

Three other tests have the same problem, They were fixed together.
mysqlbinlog-cp932
binlog_incident
binlog_tmp_table

mysql-test/suite/binlog/r/binlog_incident.result

@@ -1,3 +1,4 @@
+RESET MASTER;
 CREATE TABLE t1 (a INT);
 INSERT INTO t1 VALUES (1),(2),(3);
 SELECT * FROM t1;

mysql-test/suite/binlog/r/binlog_tmp_table.result

@@ -1,3 +1,4 @@
+RESET MASTER;
 create table foo (a int);
 flush logs;
 create temporary table tmp1_foo like foo;

mysql-test/suite/binlog/t/binlog_incident.test

@@ -6,6 +6,7 @@ source include/have_log_bin.inc;
 source include/have_debug.inc;
 
 let $MYSQLD_DATADIR= `select @@datadir`;
+RESET MASTER;
 
 CREATE TABLE t1 (a INT);
 
@@ -24,4 +25,4 @@ exec $MYSQL_BINLOG --start-position=106 $MYSQLD_DATADIR/master-bin.000001 >$MYSQ
 eval SELECT cont LIKE '%RELOAD DATABASE; # Shall generate syntax error%' AS `Contain RELOAD DATABASE` FROM (SELECT load_file('$MYSQLTEST_VARDIR/tmp/binlog_incident-bug44442.sql') AS cont) AS tbl;
 --enable_query_log
 
-remove_file $MYSQLTEST_VARDIR/tmp/binlog_incident-bug44442.sql;
+remove_file $MYSQLTEST_VARDIR/tmp/binlog_incident-bug44442.sql;

mysql-test/suite/binlog/t/binlog_tmp_table.test

@@ -30,6 +30,7 @@ source include/have_binlog_format_mixed_or_statement.inc;
 
 connect (master,127.0.0.1,root,,test,$MASTER_MYPORT,);
 connect (master1,127.0.0.1,root,,test,$MASTER_MYPORT,);
+RESET MASTER;
 
 create table foo (a int);