MDEV-10271: add master host/port info to slave thread exit messages

Sample log error message generated:

mysql-test/var/log/mysqld.2.err:2021-01-21 13:02:30 8 [Note] Slave SQL thread exiting, replication stopped in log 'master-bin.000001' at position 329, master: 127.0.0.1:16000
mysql-test/var/log/mysqld.2.err:2021-01-21 13:02:30 7 [Note] Slave I/O thread exiting, read up to log 'master-bin.000001', position 329, master 127.0.0.1:16000
mysql-test/var/log/mysqld.2.err:2021-01-21 13:02:30 12 [Note] Slave SQL thread exiting, replication stopped in log 'master-bin.000001' at position 329; GTID position '', master: 127.0.0.1:16000

Reviewer: knielsen@knielsen-hq.org, Andrei and Sachin

sql/slave.cc

@@ -5106,15 +5106,16 @@ log space");
   // print the current replication position
   if (mi->using_gtid == Master_info::USE_GTID_NO)
     sql_print_information("Slave I/O thread exiting, read up to log '%s', "
-                          "position %llu", IO_RPL_LOG_NAME, mi->master_log_pos);
+                          "position %llu, master %s:%d", IO_RPL_LOG_NAME, mi->master_log_pos,
+                           mi->host, mi->port);
   else
   {
     StringBuffer<100> tmp;
     mi->gtid_current_pos.to_string(&tmp);
     sql_print_information("Slave I/O thread exiting, read up to log '%s', "
-                          "position %llu; GTID position %s",
+                          "position %llu; GTID position %s, master %s:%d",
                           IO_RPL_LOG_NAME, mi->master_log_pos,
-                          tmp.c_ptr_safe());
+                          tmp.c_ptr_safe(), mi->host, mi->port);
   }
   repl_semisync_slave.slave_stop(mi);
   thd->reset_query();
@@ -5717,8 +5718,9 @@ pthread_handler_t handle_slave_sql(void *arg)
       tmp.append(STRING_WITH_LEN("'"));
     }
     sql_print_information("Slave SQL thread exiting, replication stopped in "
-                          "log '%s' at position %llu%s", RPL_LOG_NAME,
-                          rli->group_master_log_pos, tmp.c_ptr_safe());
+                          "log '%s' at position %llu%s, master: %s:%d", RPL_LOG_NAME,
+                          rli->group_master_log_pos, tmp.c_ptr_safe(),
+                          mi->host, mi->port);
   }
 #ifdef WITH_WSREP
   wsrep_after_command_before_result(thd);