Add the admin_user api function to the identity helper and the IdentityProvider interface.

modules/user/libraries/drivers/IdentityProvider/Gallery.php

@@ -28,6 +28,13 @@ class IdentityProvider_Gallery_Driver implements IdentityProvider_Driver {
     return user::guest();
   }
 
+  /**
+   * @see IdentityProvider_Driver::guest.
+   */
+  public function admin_user() {
+    return self::lookup_user(2);
+  }
+
   /**
    * @see IdentityProvider_Driver::create_user.
    */