testsuite: Pin versions of pytest and pylint

Chandan Singhrequested to merge
chandan/restrict-pylint into master

This will help us fix CI failures caused due to inadvertently picking up newer versions of pytest and pylint.

These packages should only be updated as a deliberate change and the main buildstream repository should be tested with the new versions to ensure that the test still pass.

See related buildstream!684 (closed).

Since the diff can be a bit hard to parse, here's a list of changes:

  • pin pylint version to 2.1.1
  • constrain pytest version to >=3.7
Edited by Chandan Singh

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