use urllib.request.getproxies() to pass system proxies to the provider

[lengau]

What needs to get done

Use getproxies() to forward the proxy environment variables.

Forward both all-caps and lowercase versions of the variables

Why it needs to get done

This sidesteps the problem of us having to worry about other ways of setting proxies while also handling both the upper case and lower case versions in a secure manner.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3245.

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