Description of problem:

fedpkg clone -B xguest
Traceback (most recent call last):
  File "/usr/bin/fedpkg", line 1086, in <module>
    args.command(args)
  File "/usr/bin/fedpkg", line 425, in clone
    pyfedpkg.clone_with_dirs(args.module[0], args.user)
  File "/usr/lib/python2.7/site-packages/pyfedpkg/__init__.py", line 414, in clone_with_dirs
    clone(module, user, top_path, bare_dir=repo_path)
  File "/usr/lib/python2.7/site-packages/pyfedpkg/__init__.py", line 382, in clone
    _run_command(cmd)
  File "/usr/lib/python2.7/site-packages/pyfedpkg/__init__.py", line 136, in _run_command
    subprocess.list2cmdline(cmd))
AttributeError: 'module' object has no attribute 'list2cmdline'
[Exit 1]