Remove obsolete docker-py check in setup.py

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

setup.py

@@ -3,23 +3,9 @@
 
 import codecs
 import os
-import sys
-
-import pip
 
 from setuptools import setup, find_packages
 
-try:
- if 'docker-py' in [
- x.project_name for x in pip.get_installed_distributions()]:
- print(
- 'ERROR: "docker-py" needs to be uninstalled before installing this'
- ' package:\npip uninstall docker-py', file=sys.stderr
- )
- sys.exit(1)
-except AttributeError:
- pass
-
 ROOT_DIR = os.path.dirname(__file__)
 SOURCE_DIR = os.path.join(ROOT_DIR)