MDEV-4984: Implement MASTER_GTID_WAIT() and @@LAST_GTID.

Couple of small fixes following buildbot testing.

mysql-test/include/sync_with_master_gtid.inc

@@ -40,7 +40,8 @@ if (!$_slave_timeout)
 if ($_result == -1)
 {
   --let $_current_gtid_pos= `SELECT @@GLOBAL.gtid_slave_pos`
-  --die Timeout in master_gtid_wait('$master_pos', $_slave_timeout), current slave GTID position is: $_current_gtid_pos.
+  --echo Timeout in master_gtid_wait('$master_pos', $_slave_timeout), current slave GTID position is: $_current_gtid_pos.
+  --die Failed to sync with master
 }
 
 --let $include_filename= sync_with_master_gtid.inc

mysql-test/suite/rpl/r/rpl_gtid_basic.result

@@ -272,7 +272,7 @@ SELECT master_gtid_wait('2-1-1,1-1-4,0-1-110');
 SELECT master_gtid_wait('0-1-1000', 0.5);
 SELECT master_gtid_wait('0-1-2000');
 SELECT master_gtid_wait('2-1-10');
-SELECT master_gtid_wait('2-1-5', 1);
+SELECT master_gtid_wait('2-1-6', 1);
 SELECT master_gtid_wait('2-1-5');
 SELECT master_gtid_wait('2-1-10');
 SELECT master_gtid_wait('2-1-5,1-1-4,0-1-110');
@@ -284,14 +284,14 @@ SELECT master_gtid_wait('0-1-109');
 SELECT master_gtid_wait('2-1-2', 0.5);
 master_gtid_wait('2-1-2', 0.5)
 -1
-KILL QUERY 22;
+KILL QUERY KILL_ID;
 ERROR 70100: Query execution was interrupted
 SET gtid_domain_id=2;
 SET gtid_seq_no=2;
 INSERT INTO t1 VALUES (4);
 master_gtid_wait('2-1-2')
 0
-KILL CONNECTION 25;
+KILL CONNECTION KILL_ID;
 ERROR HY000: Lost connection to MySQL server during query
 SET gtid_domain_id=1;
 SET gtid_seq_no=4;
@@ -305,8 +305,8 @@ master_gtid_wait('2-1-1,1-1-4,0-1-110')
 0
 master_gtid_wait('0-1-1000', 0.5)
 -1
-master_gtid_wait('2-1-5', 1)
-0
+master_gtid_wait('2-1-6', 1)
+-1
 master_gtid_wait('0-1-109')
 0
 SET gtid_domain_id=2;

mysql-test/suite/rpl/t/rpl_gtid_basic.test

@@ -287,7 +287,7 @@ send SELECT master_gtid_wait('0-1-2000');
 send SELECT master_gtid_wait('2-1-10');
 
 --connect (s5,127.0.0.1,root,,test,$SERVER_MYPORT_2,)
-send SELECT master_gtid_wait('2-1-5', 1);
+send SELECT master_gtid_wait('2-1-6', 1);
 
 # This one we will kill also.
 --connect (s6,127.0.0.1,root,,test,$SERVER_MYPORT_2,)
@@ -314,6 +314,7 @@ send SELECT master_gtid_wait('0-1-109');
 # This one should time out.
 SELECT master_gtid_wait('2-1-2', 0.5);
 
+--replace_result $kill1_id KILL_ID
 eval KILL QUERY $kill1_id;
 --connection s3
 --error ER_QUERY_INTERRUPTED
@@ -328,6 +329,7 @@ INSERT INTO t1 VALUES (4);
 reap;
 
 --connection server_2
+--replace_result $kill2_id KILL_ID
 eval KILL CONNECTION $kill2_id;
 
 --connection s6

mysql-test/suite/sys_vars/t/last_gtid_basic.test

+--source include/not_embedded.inc
+
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 SELECT @@global.last_gtid;
 

sql/rpl_gtid.cc

@@ -1792,7 +1792,7 @@ gtid_waiting::wait_for_gtid(THD *thd, rpl_gtid *wait_gtid,
   bool timed_out= false;
 #ifdef HAVE_REPLICATION
   queue_element elem;
-  uint32_t domain_id= wait_gtid->domain_id;
+  uint32 domain_id= wait_gtid->domain_id;
   uint64 seq_no= wait_gtid->seq_no;
   hash_element *he;
   rpl_slave_state::element *slave_state_elem= NULL;
@@ -1958,10 +1958,6 @@ gtid_waiting::wait_for_gtid(THD *thd, rpl_gtid *wait_gtid,
       thd_wait_end(thd);
     }
 
-    if (elem.wakeup_reason == queue_element::DONE)
-      break;
-    takeover= true;
-
     if (thd->killed || timed_out)
     {
       remove_from_wait_hash(he, &elem);
@@ -1975,6 +1971,10 @@ gtid_waiting::wait_for_gtid(THD *thd, rpl_gtid *wait_gtid,
         thd->send_kill_message();
       break;
     }
+
+    if (elem.wakeup_reason == queue_element::DONE)
+      break;
+    takeover= true;
   }
 
   if (did_enter_cond)