MDEV-9106 Audit plugin doesnt run with MySQL 5.7.

   updata thread_pool_server_audit test result.

mysql-test/suite/plugins/r/thread_pool_server_audit.result

@@ -8,6 +8,7 @@ server_audit_file_rotate_now	OFF
 server_audit_file_rotate_size	1000000
 server_audit_file_rotations	9
 server_audit_incl_users	
+server_audit_loc_info	
 server_audit_logging	OFF
 server_audit_mode	0
 server_audit_output_type	file
@@ -71,6 +72,7 @@ server_audit_file_rotate_now	OFF
 server_audit_file_rotate_size	1000000
 server_audit_file_rotations	9
 server_audit_incl_users	odin, root, dva, tri
+server_audit_loc_info	
 server_audit_logging	ON
 server_audit_mode	0
 server_audit_output_type	file
@@ -216,6 +218,7 @@ server_audit_file_rotate_now	OFF
 server_audit_file_rotate_size	1000000
 server_audit_file_rotations	9
 server_audit_incl_users	odin, root, dva, tri
+server_audit_loc_info	
 server_audit_logging	ON
 server_audit_mode	1
 server_audit_output_type	file
@@ -229,9 +232,9 @@ Warnings:
 Warning	1620	Plugin is busy and will be uninstalled on shutdown
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,test,'set global server_audit_logging=on',0
 TIME,HOSTNAME,root,localhost,ID,0,CONNECT,mysql,,0
-TIME,HOSTNAME,root,localhost,ID,0,DISCONNECT,mysql,,0
+TIME,HOSTNAME,,,ID,0,DISCONNECT,,,0
 TIME,HOSTNAME,no_such_user,localhost,ID,0,FAILED_CONNECT,,,ID
-TIME,HOSTNAME,no_such_user,localhost,ID,0,DISCONNECT,,,0
+TIME,HOSTNAME,,,ID,0,DISCONNECT,,,0
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,test,'set global server_audit_incl_users=\'odin, root, dva, tri\'',0
 TIME,HOSTNAME,root,localhost,ID,ID,CREATE,test,t2,
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,test,'create table t2 (id int)',0
@@ -281,7 +284,7 @@ TIME,HOSTNAME,root,localhost,ID,ID,READ,mysql,proc,
 TIME,HOSTNAME,root,localhost,ID,ID,WRITE,mysql,proc,
 TIME,HOSTNAME,root,localhost,ID,ID,WRITE,mysql,event,
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,sa_db,'drop database sa_db',0
-TIME,HOSTNAME,root,localhost,ID,0,DISCONNECT,sa_db,,0
+TIME,HOSTNAME,,,ID,0,DISCONNECT,,,0
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,test,'create database sa_db',0
 TIME,HOSTNAME,root,localhost,ID,ID,QUERY,sa_db,'use sa_db',0
 TIME,HOSTNAME,root,localhost,ID,ID,WRITE,mysql,user,