Fix package version conflict

[Ark-kun]

This change is 

[hongye-sun]

/lgtm

[Ark-kun]

/approve

[IronPan]

/approve

[k8s-ci-robot]

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[Ark-kun]

pip package resolving logic is broken.
The kubernetes package is incompatible with that logic:

$ python3 -m pip install kubernetes==8.0.0
Collecting kubernetes==8.0.0
...

Collecting urllib3!=1.21,>=1.19.1 (from kubernetes==8.0.0)
  Downloading https://files.pythonhosted.org/packages/81/9b/715e96377cc1f87e71d9d4259c6f88bf561a539622ba3042e73188e0bc2d/urllib3-1.25-py2.py3-none-any.whl (149kB)

Collecting requests (from kubernetes==8.0.0)
  Downloading https://files.pythonhosted.org/packages/7d/e3/20f3d364d6c8e5d2353c72a67778eb189176f08e873c9900e10c0287b84b/requests-2.21.0-py2.py3-none-any.whl (57kB)
...

requests 2.21.0 has requirement urllib3<1.25,>=1.21.1, but you'll have urllib3 1.25 which is incompatible.
Installing collected packages: certifi, urllib3, six, idna, chardet, requests, oauthlib, requests-oauthlib, websocket-client, cachetools, pyasn1, rsa, pyasn1-modules, google-auth, pyyaml, asn1crypto, pycparser, cffi, cryptography, PyJWT, python-dateutil, adal, kubernetes
Successfully installed PyJWT-1.7.1 adal-1.2.1 asn1crypto-0.24.0 cachetools-3.1.0 certifi-2019.3.9 cffi-1.12.3 chardet-3.0.4 cryptography-2.6.1 google-auth-1.6.3 idna-2.8 kubernetes-8.0.0 oauthlib-3.0.1 pyasn1-0.4.5 pyasn1-modules-0.2.4 pycparser-2.19 python-dateutil-2.8.0 pyyaml-5.1 requests-2.21.0 requests-oauthlib-1.2.0 rsa-4.0 six-1.12.0 urllib3-1.25 websocket-client-0.56.0