[Distutils] flip the pip dependencies (was Current status of PEP 439)

[Marcus Smith]

> I think we need to flip the dependencies so that pip as the installer has
> all the essential code for installation from PyPI and then setuptools and
> distlib depend on that pip infrastructure. No need to add anything to the
> standard library prematurely when we can add it to pip instead.
>
not sure about the flip, but let me break some things down a bit for those
who don't know:

what pip has internally already (i.e. literally in it's package namespace):
- pypi crawling/downloading
- wheel installing (does not require the pypi wheel project; only building
wheels requires that)

what pip has "bundled' already:
- distlib (in 'pip.vendor'; currently only used for some --pre version
logic)

what pip still needs to be self-sufficient to do wheel installs:
- something bundled or internal that does what pkg_resources does

theoretical options:
1)  bundle setuptools/pkg_resources
2)  use the bundled distlib to replace our use of pkg_resources
3)  internalize pkg_resources as pip.pkg_resources (i.e. fork off
pkg_resources)

Marcus
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