[ci skip] Change some log messages' level

'Class Loaded' type of messages flood log files when
log_threshold is set to 2 (debug). They're now logged
as 'info' level.

This is manually applying PR #1528, which was created
to do the same thing, but became outdated.
diff --git a/system/libraries/Xmlrpcs.php b/system/libraries/Xmlrpcs.php
index f786b23..2ab8627 100644
--- a/system/libraries/Xmlrpcs.php
+++ b/system/libraries/Xmlrpcs.php
@@ -104,7 +104,7 @@
 			$this->methods = array_merge($this->methods, $config['functions']);
 		}
 
-		log_message('debug', 'XML-RPC Server Class Initialized');
+		log_message('info', 'XML-RPC Server Class Initialized');
 	}
 
 	// --------------------------------------------------------------------