amend: use context manager for config override
Differential Revision: https://phab.mercurial-scm.org/D639
#require test-repo pylint hg10
Run pylint for known rules we care about.
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There should be no recorded failures; fix the codebase before introducing a
new check.
Current checks:
- W0102: no mutable default argument
$ touch $TESTTMP/fakerc
$ pylint --rcfile=$TESTTMP/fakerc --disable=all \
> --enable=W0102 --reports=no \
> mercurial hgdemandimport hgext hgext3rd
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