Do not SET DEBUG_DBUG=-d,... in tests

To disable debug instrumentation, save and restore the original value
of the variable DEBUG_DBUG. Assigning -d,... will enable the output of
a lot of unrelated DBUG messages to the server error log.

mysql-test/suite/innodb/r/innodb_bug11754376.result

 CREATE TABLE bug11754376 (c INT) ENGINE=INNODB;
 SET SESSION DEBUG_DBUG='+d,test_normalize_table_name_low';
 DROP TABLE bug11754376;
-SET SESSION DEBUG_DBUG='-d,test_normalize_table_name_low';

mysql-test/suite/innodb/r/innodb_bug56947.result

@@ -3,7 +3,6 @@ create table bug56947(a int not null) engine = innodb;
 SET DEBUG_DBUG='+d,ib_rebuild_cannot_rename';
 alter table bug56947 add unique index (a);
 ERROR HY000: Got error 11 "xxx" from storage engine InnoDB
-SET DEBUG_DBUG='-d,ib_rebuild_cannot_rename';
 check table bug56947;
 Table	Op	Msg_type	Msg_text
 test.bug56947	check	status	OK

mysql-test/suite/innodb/t/innodb_bug11754376.test

@@ -12,5 +12,3 @@ CREATE TABLE bug11754376 (c INT) ENGINE=INNODB;
 SET SESSION DEBUG_DBUG='+d,test_normalize_table_name_low';
 
 DROP TABLE bug11754376;
-
-SET SESSION DEBUG_DBUG='-d,test_normalize_table_name_low';

mysql-test/suite/innodb/t/innodb_bug14147491.test

@@ -107,8 +107,5 @@ SLEEP 1;
 --enable_reconnect
 --source include/wait_until_connected_again.inc
 
-# Note SET DEBUG = '-d,innodb_page_corruption_retries' is not required
-# because the session information is lost after server restart
-
 --echo # Cleanup
 DROP TABLE t1;

mysql-test/suite/innodb/t/innodb_bug56947.test

@@ -11,7 +11,6 @@ SET DEBUG_DBUG='+d,ib_rebuild_cannot_rename';
 --replace_regex /"[^"]*"/"xxx"/
 --error ER_GET_ERRNO
 alter table bug56947 add unique index (a);
-SET DEBUG_DBUG='-d,ib_rebuild_cannot_rename';
 check table bug56947;
 
 drop table bug56947;

mysql-test/suite/innodb_fts/r/innobase_drop_fts_index_table.result

@@ -2,5 +2,4 @@ CREATE TABLE t (a INT, b TEXT) engine=innodb;
 SET debug_dbug='+d,alter_table_rollback_new_index';
 ALTER TABLE t ADD FULLTEXT INDEX (b(64));
 ERROR HY000: Unknown error
-SET debug_dbug='-d,alter_table_rollback_new_index';
 DROP TABLE t;

mysql-test/suite/innodb_fts/r/innodb_fts_misc_debug.result

@@ -88,9 +88,10 @@ title VARCHAR(200),
 body TEXT,
 FULLTEXT (title,body)
 ) ENGINE=InnoDB;
+SET @saved_debug_dbug = @@SESSION.debug_dbug;
 SET SESSION debug_dbug="+d,ib_dict_create_index_tree_fail";
 CREATE FULLTEXT INDEX idx ON articles(body);
 ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
-SET SESSION debug_dbug="-d,ib_dict_create_index_tree_fail";
+SET SESSION debug_dbug=@saved_debug_dbug;
 ALTER TABLE articles STATS_PERSISTENT=DEFAULT;
 DROP TABLE articles;

mysql-test/suite/innodb_fts/r/innodb_fts_result_cache_limit.result

@@ -26,6 +26,5 @@ SELECT COUNT(*) FROM t1 WHERE MATCH (a,b) AGAINST ('"mysql database"' IN BOOLEAN
 ERROR HY000: Table handler out of memory
 SELECT COUNT(*) FROM t1 WHERE MATCH (a,b) AGAINST ('"mysql database" @ 5' IN BOOLEAN MODE);
 ERROR HY000: Table handler out of memory
-SET SESSION debug_dbug="-d,fts_instrument_result_cache_limit";
 DROP TABLE t1;
 SET GLOBAL innodb_ft_result_cache_limit=default;

mysql-test/suite/innodb_fts/t/innobase_drop_fts_index_table.test

@@ -14,6 +14,4 @@ SET debug_dbug='+d,alter_table_rollback_new_index';
 -- error ER_UNKNOWN_ERROR
 ALTER TABLE t ADD FULLTEXT INDEX (b(64));
 
-SET debug_dbug='-d,alter_table_rollback_new_index';
-
 DROP TABLE t;

mysql-test/suite/innodb_fts/t/innodb_fts_misc_debug.test

@@ -197,10 +197,11 @@ CREATE TABLE articles (
 # Abort the operation in dict_create_index_step by setting
 # return status of dict_create_index_tree_step() to DB_OUT_OF_MEMORY
 # The newly create dict_index_t should be removed from fts cache
+SET @saved_debug_dbug = @@SESSION.debug_dbug;
 SET SESSION debug_dbug="+d,ib_dict_create_index_tree_fail";
 --error ER_OUT_OF_RESOURCES
 CREATE FULLTEXT INDEX idx ON articles(body);
-SET SESSION debug_dbug="-d,ib_dict_create_index_tree_fail";
+SET SESSION debug_dbug=@saved_debug_dbug;
 
 # This simply go through ha_innobase::commit_inplace_alter_table
 # and do a fts_check_cached_index()

mysql-test/suite/innodb_fts/t/innodb_fts_result_cache_limit.test

@@ -44,8 +44,6 @@ SELECT COUNT(*) FROM t1 WHERE MATCH (a,b) AGAINST ('"mysql database"' IN BOOLEAN
 --error 128
 SELECT COUNT(*) FROM t1 WHERE MATCH (a,b) AGAINST ('"mysql database" @ 5' IN BOOLEAN MODE);
 
-SET SESSION debug_dbug="-d,fts_instrument_result_cache_limit";
-
 DROP TABLE t1;
 
 SET GLOBAL innodb_ft_result_cache_limit=default;