Better handling of stale tokens (no more 401's)

There was a problem with stale tokens generating 401's. The
headers for the request where not replacing the stale token
with the freshly obtained one. This patch remedies that.

Change-Id: I8e7c7e01fddeec17ad9ff4254b1223820bb8e2b7

novaclient/client.py

@@ -170,6 +170,7 @@ class HTTPClient(httplib2.Http):
         except exceptions.Unauthorized, ex:
             try:
                 self.authenticate()
+                kwargs['headers']['X-Auth-Token'] = self.auth_token
                 resp, body = self._time_request(self.management_url + url,
                                                 method, **kwargs)
                 return resp, body