MDEV-12179: Per-engine mysql.gtid_slave_pos table

Intermediate commit.

.result file updates due to added --gtid-pos-auto-engines sysvar.

mysql-test/r/mysqld--help.result

@@ -257,6 +257,13 @@ The following options may be given as the first argument:
  applied; this means it is the responsibility of the user
  to ensure that GTID sequence numbers are strictly
  increasing.
+ --gtid-pos-auto-engines=name 
+ List of engines for which to automatically create a
+ mysql.gtid_slave_pos_ENGINE table, if a transaction using
+ that engine is replicated. This can be used to avoid
+ introducing cross-engine transactions, if engines are
+ used different from that used by table
+ mysql.gtid_slave_pos
  --gtid-strict-mode  Enforce strict seq_no ordering of events in the binary
  log. Slave stops with an error if it encounters an event
  that would cause it to generate an out-of-order binlog if
@@ -1254,6 +1261,7 @@ getopt-prefix-matching TRUE
 group-concat-max-len 1048576
 gtid-domain-id 0
 gtid-ignore-duplicates FALSE
+gtid-pos-auto-engines 
 gtid-strict-mode FALSE
 help TRUE
 histogram-size 0

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -1115,6 +1115,20 @@ NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
+VARIABLE_NAME	GTID_POS_AUTO_ENGINES
+SESSION_VALUE	NULL
+GLOBAL_VALUE	
+GLOBAL_VALUE_ORIGIN	COMPILE-TIME
+DEFAULT_VALUE	
+VARIABLE_SCOPE	GLOBAL
+VARIABLE_TYPE	VARCHAR
+VARIABLE_COMMENT	List of engines for which to automatically create a mysql.gtid_slave_pos_ENGINE table, if a transaction using that engine is replicated. This can be used to avoid introducing cross-engine transactions, if engines are used different from that used by table mysql.gtid_slave_pos
+NUMERIC_MIN_VALUE	NULL
+NUMERIC_MAX_VALUE	NULL
+NUMERIC_BLOCK_SIZE	NULL
+ENUM_VALUE_LIST	NULL
+READ_ONLY	NO
+COMMAND_LINE_ARGUMENT	NULL
 VARIABLE_NAME	GTID_SEQ_NO
 SESSION_VALUE	0
 GLOBAL_VALUE	NULL