Use Config helper (#10339)

remove usage of global variable

LibreNMS/Config.php

@@ -336,6 +336,16 @@ class Config
         return json_encode($config);
     }
 
+    /**
+     * Get the full configuration array
+     * @return array
+     */
+    public static function getAll()
+    {
+        global $config;
+        return $config;
+    }
+
     /**
      * merge the database config with the global config
      * Global config overrides db