(#533) Support packages.config file in upgrade

[Apteryx0]

Implements a subset of the functionality, support for packages.config
files in the upgrade command. Also extended the tests to test the new
code. I did not see any value in implementing package.config support for
uninstall because the problem I am interested in solving is being able
to upgrade multiple packages each with a specific version in one
command. Since uninstall (generally?) doesn't require specifying a
version this can be done on the uninstall command line, i.e. just give
the package list to uninstall.

Closes #533

[ferventcoder]

Nice!

[ferventcoder]

Your commit summary is missing some words ;)

[Apteryx0]

Oops - is that better?

[ferventcoder]

Much better. 👍

[ferventcoder]

Please don't merge master - Merges are very bad in feature branches.

I thought we had that outlined in our CONTRIBUTING document, but it's more implied than called out directly - https://github.com/chocolatey/choco/blob/master/CONTRIBUTING.md#submit-pull-request-pr and https://github.com/chocolatey/choco/blob/master/CONTRIBUTING.md#respond-to-feedback-on-pull-request

[Apteryx0]

Sorry, I did that via the github web interface which I assumed would do the right thing. I will fix it up....

[EckyZero]

@Apteryx0 @ferventcoder what's the timeline for getting this merged in? I'm facing a similar use case currently where this feature would make my life easier.

[ferventcoder]

This has a chance to get into the next version. The linked ticket #533 has the milestone. Currently prioritized in 0.10.9.

[CLAassistant]

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