main.help: flush help tables after modifying them

otherwise following tests that crash the server will see them
corrupted

mysql-test/main/help.result

@@ -274,12 +274,16 @@ delete from mysql.help_relation where help_keyword_id=@keyword1_id and help_topi
 delete from mysql.help_relation where help_keyword_id=@keyword2_id and help_topic_id=@topic1_id;
 delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic3_id;
 delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic4_id;
-End of 4.1 tests.
-DROP TABLE IF EXISTS t1;
+flush tables;
+#
+# End of 4.1 tests.
+#
 CREATE TABLE t1 (i INT);
 LOCK TABLES t1 WRITE;
 HELP no_such_topic;
 name	is_it_category
 UNLOCK TABLES;
 DROP TABLE t1;
-End of 5.1 tests.
+#
+# End of 5.1 tests.
+#

mysql-test/main/help.test

@@ -122,25 +122,22 @@ delete from mysql.help_relation where help_keyword_id=@keyword2_id and help_topi
 delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic3_id;
 delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic4_id;
 
---echo End of 4.1 tests.
+flush tables;
+--echo #
+--echo # End of 4.1 tests.
+--echo #
 
 #
 # Test that we can use HELP even under LOCK TABLES.  See bug#9953:
 # CONVERT_TZ requires mysql.time_zone_name to be locked.
 #
---disable_warnings
-DROP TABLE IF EXISTS t1;
---enable_warnings
 
 CREATE TABLE t1 (i INT);
-
 LOCK TABLES t1 WRITE;
-
 HELP no_such_topic;
-
 UNLOCK TABLES;
-
 DROP TABLE t1;
 
-
---echo End of 5.1 tests.
+--echo #
+--echo # End of 5.1 tests.
+--echo #