Fixes an erroneous type check in a test
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

varunarya10/keystonemiddleware