Only install ipaddress if python version < 3.3

Signed-off-by: Joffrey F <joffrey@docker.com>

requirements.txt

@@ -2,4 +2,4 @@ requests==2.5.3
 six>=1.4.0
 websocket-client==0.32.0
 backports.ssl_match_hostname>=3.5 ; python_version < '3.5'
-ipaddress ; python_version < '3.5'
\ No newline at end of file
+ipaddress==1.0.16 ; python_version < '3.3'
\ No newline at end of file

setup.py

 #!/usr/bin/env python
 import os
-import sys
 from setuptools import setup
 
 ROOT_DIR = os.path.dirname(__file__)
@@ -14,7 +13,7 @@ requirements = [
 
 extras_require = {
     ':python_version < "3.5"': 'backports.ssl_match_hostname >= 3.5',
-    ':python_version < "3.5"': 'ipaddress',
+    ':python_version < "3.3"': 'ipaddress >= 1.0.16',
 }
 
 exec(open('docker/version.py').read())