Running Leap Preupgrade check from Red Hat Satellite Web UI on client hosts fails with ImportError: cannot import name UnrewindableBodyError

Issue

• Leap Preupgrade check on client hosts registered to Red Hat Satellite Server fails with below error:

  Traceback (most recent call last):
   File "/usr/bin/leapp", line 9, in <module>
      load_entry_point('leapp==0.14.0', 'console_scripts', 'leapp')()
   File "/usr/lib/python2.7/site-packages/leapp/cli/__init__.py", line 36, in main
      _load_commands(cli.command)
   File "/usr/lib/python2.7/site-packages/leapp/cli/__init__.py", line 25, in _load_commands
      package = pkgutil.get_loader(package_name).load_module(package_name)
   File "/usr/lib64/python2.7/pkgutil.py", line 246, in load_module
      mod = imp.load_module(fullname, self.file, self.filename, self.etc)
   File "/usr/lib/python2.7/site-packages/leapp/cli/commands/list_runs/__init__.py", line 6, in <module>
      from leapp.cli.commands.upgrade.util import fetch_all_upgrade_contexts
   File "/usr/lib/python2.7/site-packages/leapp/cli/commands/upgrade/__init__.py", line 9, in <module>
      from leapp.logger import configure_logger
   File "/usr/lib/python2.7/site-packages/leapp/logger/__init__.py", line 10, in <module>
      from leapp.utils.actorapi import get_actor_api, RequestException
   File "/usr/lib/python2.7/site-packages/leapp/utils/actorapi.py", line 4, in <module>
      import requests
   File "/usr/lib/python2.7/site-packages/requests/__init__.py", line 58, in <module>
      from . import utils
   File "/usr/lib/python2.7/site-packages/requests/utils.py", line 32, in <module>
      from .exceptions import InvalidURL
   File "/usr/lib/python2.7/site-packages/requests/exceptions.py", line 10, in <module>
      from urllib3.exceptions import HTTPError as BaseHTTPError
   File "/usr/lib/python2.7/site-packages/urllib3/__init__.py", line 10, in <module>
      from .connectionpool import (
   File "/usr/lib/python2.7/site-packages/urllib3/connectionpool.py", line 31, in <module>
      from .connection import (
   File "/usr/lib/python2.7/site-packages/urllib3/connection.py", line 45, in <module>
      from .util.ssl_ import (
   File "/usr/lib/python2.7/site-packages/urllib3/util/__init__.py", line 4, in <module>
      from .request import make_headers
   File "/usr/lib/python2.7/site-packages/urllib3/util/request.py", line 5, in <module>
      from ..exceptions import UnrewindableBodyError
   ImportError: cannot import name UnrewindableBodyError