devel/py-setuptools: Update to 17.0

• Update to 17.0
• Tell setuptools not to install versioned binaries (we'll do it via MAKE_ENV)
• Use uniquefiles to create versioned binaries
• Conditionally create default links (for easy_install) as well
• Remove post-patch bits accordingly, no longer needed.
• Remove upstreamed patch fixing namespace_packages
• Substitute in pkg-message.in correctly
• Update pkg-message.in
• Re-order Makefile entries

Changes:

https://pythonhosted.org/setuptools/history.html

Differential Revision: https://reviews.freebsd.org/D2704
Reviewed by: exp-run