pip list --not-required still not work with --outdated

[eirnym]

Environment

• pip version: 18.0
• Python version: 3.7
• OS: macOS
• Use virtual environment installed with python -m venv /some/path/

Description
pip list -o --not-required still list automatic dependencies despite I asked to check requested wheels.

Expected behavior
In my example I want to see empty list when explicitely requested packages has been updated

How to Reproduce
You can install packages listed below and some of them depends on outdated versions and usually incompatible with newer onces.

Output

$ pip list --not-required 
Package          Version
---------------- -------
aiohttp-devtools 0.10.1 
aiojobs          0.2.1  
aiomysql         0.0.19 
aiozeroconf      0.1.3  
colorama         0.3.9  
future           0.16.0 
Geofront         0.4.0  
ipython          6.5.0  
jwcrypto         0.5.0  
mycli            1.17.0 
pandas           0.23.4 
pipdeptree       0.13.0 
pycrypto         2.6.1  
PyJWT            1.6.4  
pysnmp           4.4.5  
pytest-flake8    1.0.2  
safety           1.8.4  
tox              3.2.1  
ujson            1.35   
wheel            0.31.1 
xlwt             1.3.0  

$ pip list -o --not-required
Package        Version Latest Type 
-------------- ------- ------ -----
more-itertools 4.2.0   4.3.0  wheel
oauthlib       1.1.2   2.1.0  wheel
prompt-toolkit 1.0.15  2.0.4  wheel
pycodestyle    2.3.1   2.4.0  wheel
pyflakes       1.6.0   2.0.0  wheel

$ pip list -o 
Package        Version Latest Type 
-------------- ------- ------ -----
more-itertools 4.2.0   4.3.0  wheel
oauthlib       1.1.2   2.1.0  wheel
prompt-toolkit 1.0.15  2.0.4  wheel
pycodestyle    2.3.1   2.4.0  wheel
pyflakes       1.6.0   2.0.0  wheel

[xavfernandez]

This should be fixed by #6116

[lock]

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