[Twisted-Python] Removing Python 2.6 Support after Twisted 15.1

[HawkOwl]

Hi,

As Python 2.6 has been officially abandoned for a year+ (and will receive no further official security updates) and Python 2.7 has been available for almost five years, it might be time to put Python 2.6 support to bed. The only currently supported distro that has Python 2.6 is RHEL6, and RHEL7 with Python 2.7 has now been out for a year.

This would be in line with other major projects (eg. Django, Plone) and Python's porting guide (https://docs.python.org/3/howto/pyporting.html#drop-support-for-python-2-6-and-older). We can also remove some things from TestCase, and there's random smatterings of 2.6 support workarounds/comments that we could also remove.

As such, I think we should make 15.1 the final release which officially supports Python 2.6.

Any objections?

- Hawkie
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