Merge pull request kubernetes-client#2189 from tomplus/chore/remove-ipaddress

remove ipaddress from requirements.txt

Author: k8s-ci-robot

requirements.txt

@@ -4,7 +4,6 @@ python-dateutil>=2.5.3  # BSD
 setuptools>=21.0.0  # PSF/ZPL
 pyyaml>=5.4.1  # MIT
 google-auth>=1.0.1  # Apache-2.0
-ipaddress>=1.0.17;python_version=="2.7"  # PSF
 websocket-client>=0.32.0,!=0.40.0,!=0.41.*,!=0.42.* # LGPLv2+
 requests # Apache-2.0
 requests-oauthlib # ISC