Fixes an erroneous type check in a test

The latest version of requests changes the type of a Response's history.
See https://github.com/kennethreitz/requests/commit/b8128d6

Closes-Bug: #1321042
Change-Id: Iba9fa20d22d878a4298a35e270338ee442031796

keystoneclient/session.py

@@ -256,10 +256,6 @@ class Session(object):
 
         resp = self._send_request(url, method, redirect, **kwargs)
 
-        # NOTE(jamielennox): we create a tuple here to be the same as what is
-        # returned by the requests library.
-        resp.history = tuple(resp.history)
-
         if raise_exc and resp.status_code >= 400:
             _logger.debug('Request returned failure status: %s',
                           resp.status_code)

keystoneclient/tests/test_session.py

@@ -235,7 +235,6 @@ class RedirectTests(utils.TestCase):
 
         ses_resp = session.get(self.REDIRECT_CHAIN[0])
 
-        self.assertEqual(type(req_resp.history), type(ses_resp.history))
         self.assertEqual(len(req_resp.history), len(ses_resp.history))
 
         for r, s in zip(req_resp.history, ses_resp.history):