[python-docker-py/f19] (3 commits) ...versioned python-requests only for f21+

[Lokesh Mandvekar]

Summary of changes:

  ec73f9c... update to 0.5.3 (*)
  caa93e7... Resolves: rhbz#1153991 - update to 0.5.3 (*)
  51b6959... versioned python-requests only for f21+ (*)

(*) This commit already existed in another branch; no separate mail sent