Akihiro Motoki d64c25c019 Follow-up: Move linters dependencies to tox.ini ...

After commit 89e2fad8ef,
pep8/bandit/bashate tox envs have different dependencies than
the default tox env. If tox envs with different dependencies share
some common envdir, tox env will be recreated every time a different
tox env is specified. (For example, "tox -e cover" after "tox -e pep8"
recreates the tox env.)

To address it, this commit introduces a new common envdir for linters
(envdir = {toxworkdir}/lint). It also moves deependencies of bashate
and bandit envs to pep8 env to ensure these three tox envs have the
same dependencies.

Cleanups are also made in test-requirements and lower-constraints.
* astroid and isort can be dropped from test-requirements.txt
  as pylint has proper version cappings for astroid and isort.
  (These cappings are available in pylint 2.5 and later.)
* reno is a document dependency, so it is unnecessary in test-requirements.
* reno, astroid and isort are dropped from lower-constraints
  as they are not installed in lower-constraints tests.

Change-Id: Iaa3168764d050875e3d08784aee2dfba809e53be

2021-01-07 04:26:07 +09:00

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