MDEV-7037: MariaDB 10.0 does not build on Debian / kfreebsd-i386/amd64 due to...

MDEV-7037: MariaDB 10.0 does not build on Debian / kfreebsd-i386/amd64 due to MTR failure: multi_source.gtid
MDEV-7106: Sporadic test failure in multi_source.gtid
MDEV-7153: Yet another sporadic failure of multi_source.gtid in buildbot

This patch fixes three races in the multi_source.gtid test case that could
cause sporadic failures:

1. Do not put SHOW ALL SLAVES STATUS in the output, the output is not stable.

2. Ensure that slave1 has replicated as far as expected, before stopping its
connection to master1 (otherwise the following wait will time out due to rows
not replicated from master1).

3. Ensure that slave2 has replicated far enough before connecting slave1 to it
(otherwise we get an error during connect that slave1 is ahead of slave2).

mysql-test/suite/multi_source/gtid.result

@@ -26,59 +26,6 @@ SET SQL_LOG_BIN=0;
 CREATE TABLE t3 (a INT PRIMARY KEY, b VARCHAR(10));
 SET SQL_LOG_BIN=1;
 INSERT INTO t3 VALUES (201, "initial 2");
-SHOW ALL SLAVES STATUS;
-Connection_name	
-Slave_SQL_State	Slave has read all relay log; waiting for the slave I/O thread to update it
-Slave_IO_State	Waiting for master to send event
-Master_Host	127.0.0.1
-Master_User	root
-Master_Port	MYPORT_3
-Connect_Retry	60
-Master_Log_File	server3-bin.000001
-Read_Master_Log_Pos	1501
-Relay_Log_File	mysqld-relay-bin.000002
-Relay_Log_Pos	1790
-Relay_Master_Log_File	server3-bin.000001
-Slave_IO_Running	Yes
-Slave_SQL_Running	Yes
-Replicate_Do_DB	
-Replicate_Ignore_DB	
-Replicate_Do_Table	
-Replicate_Ignore_Table	
-Replicate_Wild_Do_Table	
-Replicate_Wild_Ignore_Table	
-Last_Errno	0
-Last_Error	
-Skip_Counter	0
-Exec_Master_Log_Pos	1501
-Relay_Log_Space	2088
-Until_Condition	None
-Until_Log_File	
-Until_Log_Pos	0
-Master_SSL_Allowed	No
-Master_SSL_CA_File	
-Master_SSL_CA_Path	
-Master_SSL_Cert	
-Master_SSL_Cipher	
-Master_SSL_Key	
-Seconds_Behind_Master	0
-Master_SSL_Verify_Server_Cert	No
-Last_IO_Errno	0
-Last_IO_Error	
-Last_SQL_Errno	0
-Last_SQL_Error	
-Replicate_Ignore_Server_Ids	
-Master_Server_Id	3
-Master_SSL_Crl	
-Master_SSL_Crlpath	
-Using_Gtid	No
-Gtid_IO_Pos	
-Retried_transactions	0
-Max_relay_log_size	1073741824
-Executed_log_entries	25
-Slave_received_heartbeats	0
-Slave_heartbeat_period	60.000
-Gtid_Slave_Pos	1-1-4,2-2-3
 *** Now move slave2 to replicate from both master1 and master2 instead of just slave1 ***
 STOP ALL SLAVES;
 Warnings:
@@ -102,9 +49,11 @@ INSERT INTO t1 VALUES (3, "switch 2");
 INSERT INTO t3 VALUES (103, "switch 2 a");
 INSERT INTO t2 VALUES (3, "switch 2");
 INSERT INTO t3 VALUES (203, "switch 2 b");
+include/save_master_gtid.inc
 STOP SLAVE 'slave2';
 INSERT INTO t2 VALUES (4, "switch 3");
 INSERT INTO t3 VALUES (204, "switch 3 b");
+include/sync_with_master_gtid.inc
 CHANGE MASTER TO master_port=MYPORT_4, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;
 START SLAVE;
 SELECT * FROM t1 ORDER BY a;

mysql-test/suite/multi_source/gtid.test

@@ -58,8 +58,6 @@ INSERT INTO t3 VALUES (201, "initial 2");
 --source include/wait_condition.inc
 --let $wait_condition= SELECT (SELECT COUNT(*) FROM t1)=1 AND (SELECT COUNT(*) FROM t2)=1 AND (SELECT COUNT(*) FROM t3)=2
 --source include/wait_condition.inc
---replace_result $SERVER_MYPORT_3 MYPORT_3
-query_vertical SHOW ALL SLAVES STATUS;
 
 --echo *** Now move slave2 to replicate from both master1 and master2 instead of just slave1 ***
 STOP ALL SLAVES;
@@ -93,6 +91,8 @@ set default_master_connection = '';
 --connection slave1
 # Set up so that slave1 will have to start from two different positions
 # in the slave2 binlog (one for each domain_id).
+--let $wait_condition= SELECT (SELECT COUNT(*) FROM t1)=2 AND (SELECT COUNT(*) FROM t2)=2 AND (SELECT COUNT(*) FROM t3)=4
+--source include/wait_condition.inc
 STOP SLAVE 'slave1';
 
 --connection master1
@@ -106,6 +106,7 @@ INSERT INTO t3 VALUES (103, "switch 2 a");
 --connection master2
 INSERT INTO t2 VALUES (3, "switch 2");
 INSERT INTO t3 VALUES (203, "switch 2 b");
+--source include/save_master_gtid.inc
 
 --connection slave1
 --let $wait_condition= SELECT (SELECT COUNT(*) FROM t1)=2 AND (SELECT COUNT(*) FROM t2)=3 AND (SELECT COUNT(*) FROM t3)=5
@@ -116,6 +117,12 @@ STOP SLAVE 'slave2';
 INSERT INTO t2 VALUES (4, "switch 3");
 INSERT INTO t3 VALUES (204, "switch 3 b");
 
+--connection slave2
+# Make sure that slave2 has replicated far enough before connecting slave1 to
+# it (otherwise we get an error that slave1 requested to start from a GTID
+# which is not in slave2's binlogs).
+--source include/sync_with_master_gtid.inc
+
 --connection slave1
 --replace_result $SERVER_MYPORT_4 MYPORT_4 
 eval CHANGE MASTER TO master_port=$SERVER_MYPORT_4, master_host='127.0.0.1', master_user='root', master_use_gtid=current_pos;