never add new error messages to old GA releases!

this fixes aae49327

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

@@ -9,7 +9,7 @@ Non-existed domain is warned, the command completes without rotation
 but with a warning
 FLUSH BINARY LOGS DELETE_DOMAIN_ID = (99);
 Warnings:
-Warning	1982	The gtid domain being deleted ('99') is not in the current binlog state
+Warning	1076	The gtid domain being deleted ('99') is not in the current binlog state
 show binary logs;
 Log_name	File_size
 master-bin.000001	#
@@ -36,15 +36,15 @@ Already deleted domain in Gtid_list of the earliest log is benign
 but may cause a warning
 FLUSH BINARY LOGS DELETE_DOMAIN_ID = (1);
 Warnings:
-Warning	1982	The current gtid binlog state is incompatible with a former one missing gtids from the '1-1' domain-server pair which is referred to in the gtid list describing an earlier state. Ignore if the domain ('1') was already explicitly deleted.
-Warning	1982	The gtid domain being deleted ('1') is not in the current binlog state
+Warning	1076	The current gtid binlog state is incompatible with a former one missing gtids from the '1-1' domain-server pair which is referred to in the gtid list describing an earlier state. Ignore if the domain ('1') was already explicitly deleted.
+Warning	1076	The gtid domain being deleted ('1') is not in the current binlog state
 FLUSH BINARY LOGS DELETE_DOMAIN_ID = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 0);
 ERROR HY000: Could not delete gtid domain. Reason: binlog files may contain gtids from the domain ('1') being deleted. Make sure to first purge those files.
 FLUSH BINARY LOGS;
 PURGE BINARY LOGS TO 'master-bin.000005';
 FLUSH BINARY LOGS DELETE_DOMAIN_ID = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 0);
 Warnings:
-Warning	1982	The gtid domain being deleted ('0') is not in the current binlog state
+Warning	1076	The gtid domain being deleted ('0') is not in the current binlog state
 Gtid_list of the current binlog does not contain 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 0:
 show binlog events in 'master-bin.000006' limit 1,1;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
@@ -73,6 +73,6 @@ PURGE BINARY LOGS TO 'master-bin.000007';
 the following command succeeds with warnings
 FLUSH BINARY LOGS DELETE_DOMAIN_ID = (1);
 Warnings:
-Warning	1982	The current gtid binlog state is incompatible with a former one having a gtid '11-11-1' which is less than the '11-11-11' of the gtid list describing an earlier state. The state may have been affected by manually injecting a lower sequence number gtid or via replication.
+Warning	1076	The current gtid binlog state is incompatible with a former one having a gtid '11-11-1' which is less than the '11-11-11' of the gtid list describing an earlier state. The state may have been affected by manually injecting a lower sequence number gtid or via replication.
 DROP TABLE t;
 RESET MASTER;

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

@@ -3,4 +3,4 @@ FLUSH BINARY LOGS DELETE_DOMAIN_ID = (99);
 ERROR HY000: Could not delete gtid domain. Reason: injected error.
 SHOW WARNINGS;
 Level	Code	Message
-Error	1982	Could not delete gtid domain. Reason: injected error.
+Error	1076	Could not delete gtid domain. Reason: injected error.

sql/share/errmsg-utf8.txt

@@ -1732,8 +1732,8 @@ ER_WRONG_AUTO_KEY 42000 S1009
         spa "Puede ser solamente un campo automatico y este debe ser definido como una clave"
         swe "Det får finnas endast ett AUTO_INCREMENT-fält och detta måste vara en nyckel"
         ukr "Невірне визначення таблиці; Може бути лише один автоматичний стовбець, що повинен бути визначений як ключ"
-ER_UNUSED_9
-        eng "You should never see it"
+ER_BINLOG_CANT_DELETE_GTID_DOMAIN
+	eng "Could not delete gtid domain. Reason: %s."
 ER_NORMAL_SHUTDOWN  
         cze "%s: normální ukončení\n"
         dan "%s: Normal nedlukning\n"
@@ -7118,7 +7118,7 @@ ER_SUBQUERIES_NOT_SUPPORTED 42000
         eng "%s does not support subqueries or stored functions."
 ER_SET_STATEMENT_NOT_SUPPORTED 42000
         eng "The system variable %.200s cannot be set in SET STATEMENT." 
-ER_UNUSED_17
+ER_UNUSED_9
         eng "You should never see it"
 ER_USER_CREATE_EXISTS
         eng "Can't create user '%-.64s'@'%-.64s'; it already exists"
@@ -7142,5 +7142,3 @@ ER_NO_EIS_FOR_FIELD
 ER_WARN_AGGFUNC_DEPENDENCE
         eng "Aggregate function '%-.192s)' of SELECT #%d belongs to SELECT #%d"
         ukr "Агрегатна функція '%-.192s)' з SELECTу #%d належить до SELECTу #%d"
-ER_BINLOG_CANT_DELETE_GTID_DOMAIN
-	eng "Could not delete gtid domain. Reason: %s."