[Distutils] Please do not remove dependency_links

[Marcus Smith]

>
>
> Imposing backwards incompatible changes like this one, however well
> justified, always brings with it a certain responsibility to help users in
> managing the transition. In this case, I suspect a *separate* link scanning
> tool (which we can put as many security warnings on as you like) that
> generates a requirements.txt file may be a more appropriate approach than
> just telling users to use built packages on a private HTTP or PyPI server,
> since spinning up and maintaining new server infrastructure is often a much
> more challenging prospect in user environments than installing and using a
> new client tool.
>

so, instead of

    pip install  git+https://myrepo@master#egg=toplevelapp

it's this:

    deplinks_scantool  git+https://myrepo@master#egg=toplevelapp  >
requirements.txt
    pip install -r requirements.txt


the scan tool step is pretty hefty in that it's downloading and running
egg_info, but yes, I can see that being easier for some users than dealing
with packaging
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