[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to do the same thing, but became outdated.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/Encryption.php b/system/libraries/Encryption.php
index ef67b4c..95b183a3 100644
--- a/system/libraries/Encryption.php
+++ b/system/libraries/Encryption.php
@@ -171,7 +171,7 @@
 			$this->_key = $key;
 		}
 
-		log_message('debug', 'Encryption Class Initialized');
+		log_message('info', 'Encryption Class Initialized');
 	}
 
 	// --------------------------------------------------------------------
@@ -268,7 +268,7 @@
 
 			if ($this->_handle = mcrypt_module_open($this->_cipher, '', $this->_mode, ''))
 			{
-				log_message('debug', 'Encryption: MCrypt cipher '.strtoupper($this->_cipher).' initialized in '.strtoupper($this->_mode).' mode.');
+				log_message('info', 'Encryption: MCrypt cipher '.strtoupper($this->_cipher).' initialized in '.strtoupper($this->_mode).' mode.');
 			}
 			else
 			{
@@ -322,7 +322,7 @@
 			else
 			{
 				$this->_handle = $handle;
-				log_message('debug', 'Encryption: OpenSSL initialized with method '.strtoupper($handle).'.');
+				log_message('info', 'Encryption: OpenSSL initialized with method '.strtoupper($handle).'.');
 			}
 		}
 	}