we don't support python2 anymore, so no need to install them for
python2 anymore.
also, this helps to silence the messages from pip like
```
Ignoring pytest: markers 'python_version < "3.5"' don't match your environment
Ignoring mock: markers 'python_version < "3.3"' don't match your environment
```
Signed-off-by: Kefu Chai <kchai@redhat.com>
-mock; python_version <= '3.3'
pytest<4
pytest-cov
pytest-instafail
pytest-cov==2.7.1
-mock; python_version <= '3.3'
-ipaddress; python_version < '3.3'
-e../../python-common
kubernetes
requests-mock
six
-pytest >=2.1.3,<5; python_version < '3.5'
-mock; python_version < '3.3'
mypy; python_version >= '3'
pytest-mypy; python_version >= '3'
pytest >= 2.1.3; python_version >= '3'