[Twisted-Python] Python 2.7.5 support

[Jason Litzinger]

Hello,
I've done some preliminary digging into ticket 8037 and added my
findings to the comments.  One question that came from that
investigation is whether python 2.7.5 is still officially supported by
Twisted?

Per [1] I'm assuming yes as there appears to be a buildbot job that uses
this version (RHEL7, [2]) but I did want to confirm before I looked into any
kind of fix.

Thanks!
-Jason

[1] https://twistedmatrix.com/documents/current/core/development/policy/compatibility-policy.html#supporting-and-de-supporting-python-versions
[2] https://buildbot.twistedmatrix.com/builders/rhel7-py2.7/builds/826/steps/select/logs/stdio