issue 5060 upgrade virtualenv to latest (20.2.2)

[kroustou]

#5060 #5036

[blag]

You need to run make requirements to regenerate a lot of the requirements.txt files for the various Python packages. The Travis CI linter should have caught that.

[arm4b]

Thanks for the PR! That's a good start.

Besides of feedback @blag provided, there are more places where pip, virtualenv versions are pinned.

Let's update them too. Here are the pointers:

• st2/Makefile

  Lines 398 to 402 in e5131b8

  	# NOTE We need to upgrade setuptools to avoid bug with dependency resolving in old versions
  	# Setuptools 42 added support for python_requires, which is used by the configparser package,
  	# which is required by the importlib-metadata package
  	$(VIRTUALENV_ST2CLIENT_DIR)/bin/pip install --upgrade "pip==$(PIP_VERSION)"
  	$(VIRTUALENV_ST2CLIENT_DIR)/bin/pip install --upgrade "setuptools==44.1.0"

• st2/Makefile

  Lines 535 to 537 in e5131b8

  	# setuptools >= 41.0.1 is required for packs.install in dev envs
  	# setuptools >= 42 is required so setup.py install respects dependencies' python_requires
  	$(VIRTUALENV_DIR)/bin/pip install --upgrade "setuptools==44.1.0"

• Every Dockerfile in the st2packaging-dockerfiles repository, like: https://github.com/StackStorm/st2packaging-dockerfiles/blob/master/packagingbuild/xenial/Dockerfile#L50-L51

[kroustou]

StackStorm/st2packaging-dockerfiles#97 i need to upgrade this PR to latest and resolve conflicts before reviewing

[kroustou]

It looks like Travis timed out

[amanda11]

Tried to resolve conflicts, so can see if we can merge before release freeze. Note cannot update PIP_VERSION variable to 20.3.3 as make requirements then fails, it is known that there are issues with the changes that affects make requirements. So left that as the previous version.
Looking at the components requirement txt files, then virtualenv doesn't get mentioned in them.
Will need to re-test manually with the packaging file from: https://github.com/StackStorm/st2packaging-dockerfiles/pull/97/files

[amanda11]

@kroustou I think this has been superseded by changes committed to master under PR #5123.