Merge pull request #138 from pkalever/fix_invalid_syntax

fix compiler error: in Python 3.x, using "as" is required to assign an exception to a variable.

rtslib/root.py

@@ -188,7 +188,7 @@ def _get_saveconf(self, so_path, save_file):
         try:
             with open(save_file, "r") as f:
                 saveconf = json.loads(f.read())
-        except IOError, e:
+        except IOError as e:
             if e.errno == errno.ENOENT:
                 saveconf = {'storage_objects': [], 'targets': []}
             else: