Description of problem:
fedora-burn-yubikey fails with python package error:
 fedora-burn-yubikey -u cdaley -S 2
Traceback (most recent call last):
  File "/usr/sbin/fedora-burn-yubikey", line 13, in <module>
    from fedora.client import AccountSystem, AuthError
  File "/usr/lib/python2.7/site-packages/fedora/client/__init__.py", line 132, in <module>
    from fedora.client.openidbaseclient import OpenIdBaseClient
  File "/usr/lib/python2.7/site-packages/fedora/client/openidbaseclient.py", line 42, in <module>
    from requests.packages.urllib3.util import Retry
ImportError: cannot import name Retry

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. sudo dnf install fedora-packager
2.sudo fedora-burn-yubikey -u <username> -S 2
3.

Actual results:
 fedora-burn-yubikey -u cdaley -S 2
Traceback (most recent call last):
  File "/usr/sbin/fedora-burn-yubikey", line 13, in <module>
    from fedora.client import AccountSystem, AuthError
  File "/usr/lib/python2.7/site-packages/fedora/client/__init__.py", line 132, in <module>
    from fedora.client.openidbaseclient import OpenIdBaseClient
  File "/usr/lib/python2.7/site-packages/fedora/client/openidbaseclient.py", line 42, in <module>
    from requests.packages.urllib3.util import Retry
ImportError: cannot import name Retry

Expected results:
It should succeed and allow the user to finish registering their yubikey with fedora account system

Additional info:
Looks like line #42 of /usr/lib/python2.7/site-packages/fedora/client/openidbaseclient.py need to be changed from
from requests.packages.urllib3.util import Retry
to 
from urllib3.util import Retry