test needs to cleanup after itself

Author: vuvova

mysql-test/main/mysql.test

@@ -610,6 +610,7 @@ EOF
 create database `aa``bb````cc`;
 --exec $MYSQL < $MYSQLTEST_VARDIR/tmp/backticks.sql
 drop database `aa``bb````cc`;
+--remove_file $MYSQLTEST_VARDIR/tmp/backticks.sql
 
 #
 # MySQL Bug#13639125 DELIMITER STRIPS THE NEXT NEW LINE IN A SQL STATEMENT
@@ -620,6 +621,7 @@ delimiter
 <<" as a;
 EOF
 --exec $MYSQL < $MYSQLTEST_VARDIR/tmp/13639125.sql
+--remove_file $MYSQLTEST_VARDIR/tmp/13639125.sql
 
 #
 # --skip-column-names and alignment
@@ -702,7 +704,7 @@ select count(*) from t1; truncate table t1;
  --exec $MYSQL --disable-local-infile -e "/*q*/$ldli"
 select count(*) from t1; truncate table t1;
 drop table t1;
-
+--remove_file $MYSQLTEST_VARDIR/tmp/bug.sql
 
 --echo #
 --echo # MDEV-15538 '-N' Produce html output wrong