[Twisted-Python] Problem with osx10.10-py2.7 builder

[jonathan vanasco]

> On Apr 2, 2018, at 7:13 AM, Adi Roiban <adi at roiban.ro> wrote:
> 
> FYI buildbot/osx10.10-py2.7 is broken again


FWIW, `pip` on OSX (perhaps others?) swallows the 403 error about TLS brownouts on pypi for the 1.0/1.1 ending next week. No error is raised, and you just get an empty match for installable versions of anything. (it needs to be run as `-vvvv` to see/know there is an actual error).  If that is the issue, the 9.0.3 version of pip is compatible with the new TLS and upgrading to it will fix things.

This broke my CI system a few weeks ago, and has done the same for everyone i know with a CI running on macs.