WL#11057: Make caching_sha2_password default authentication mechanism

Post push fix
- Recording updated results for xplugin connection test

Author: harinvadodaria

rapid/plugin/x/tests/mtr/r/connection_yassl.result

@@ -836,7 +836,7 @@ SSL/TLS
 0 rows affected
 RUN SELECT USER()
 USER()
-root@localhost
+x_root@localhost
 0 rows affected
 RUN SHOW STATUS LIKE 'Mysqlx_ssl_version'
 Variable_name	Value
@@ -1703,7 +1703,7 @@ SSL/TLS
 0 rows affected
 RUN SELECT USER()
 USER()
-root@localhost
+x_root@localhost
 0 rows affected
 RUN SHOW STATUS LIKE 'Mysqlx_ssl_version'
 Variable_name	Value
@@ -2570,7 +2570,7 @@ SSL/TLS
 0 rows affected
 RUN SELECT USER()
 USER()
-root@localhost
+x_root@localhost
 0 rows affected
 RUN SHOW STATUS LIKE 'Mysqlx_ssl_version'
 Variable_name	Value