py33: sort the files parameters of "--files"

In Python 3.3, hash randomization is enabled by default. It causes the
iteration order of dicts and sets to be unpredictable and differ across
Python runs.

Sort the files parameters when multiple files are designated.

Close-Bug #1235096

Change-Id: I0db645b3fb92408bd8c6780bfabe7ce8265a65a8

novaclient/base.py

@@ -353,7 +353,8 @@ def _boot(self, resource_url, response_key, name, image, flavor,
         # either an open file *or* some contents as files here.
         if files:
             personality = body['server']['personality'] = []
-            for filepath, file_or_string in files.items():
+            for filepath, file_or_string in sorted(files.items(),
+                                                   key=lambda x: x[0]):
                 if hasattr(file_or_string, 'read'):
                     data = file_or_string.read()
                 else: