Revert "reduce pep8 requirements to just hacking"
This reverts commit 1e287ae14b
Constraints mechanism doesn't work for 'hacking' lib:
I11eb0d762869ad8920795fb710f1b2eeb9354f12
We have to install all of test-requirements to get
'hacking' at the right version.
Closes-Bug: #1648054
Change-Id: I512192e8a9ab3a53a52e6cc4d4b8a222951af7fb
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