Auth Plugin API: add THD to MYSQL_SERVER_AUTH_INFO

so that auth plugins could use various thd services

include/mysql/plugin_auth.h

@@ -27,7 +27,7 @@
 
 #include <mysql/plugin.h>
 
-#define MYSQL_AUTHENTICATION_INTERFACE_VERSION 0x0200
+#define MYSQL_AUTHENTICATION_INTERFACE_VERSION 0x0201
 
 #include <mysql/plugin_auth_common.h>
 
@@ -105,6 +105,11 @@ typedef struct st_mysql_server_auth_info
   */
   unsigned int host_or_ip_length;
 
+  /**
+    Current THD pointer (to use with various services)
+  */
+  MYSQL_THD thd;
+
 } MYSQL_SERVER_AUTH_INFO;
 
 /**

include/mysql/plugin_auth.h.pp

@@ -504,6 +504,7 @@ typedef struct st_mysql_server_auth_info
   int password_used;
   const char *host_or_ip;
   unsigned int host_or_ip_length;
+  void* thd;
 } MYSQL_SERVER_AUTH_INFO;
 struct st_mysql_auth
 {