Port twisted.internet.base to Python 3

[itamar]

twisted.internet.base should run on Python 3.

[itamarst]

(In [35978]) Branching to 'base-py3-6065'

[itamar]

Ready for review.

 http://buildbot.twistedmatrix.com/boxes-supported?branch=/branches/base-py3-6065

[itamar]

You'll want the 2nd build. Sigh.

[itamar]

Taking it back from review, discovered another relevant test module.

[itamar]

OK, started another build:

 http://buildbot.twistedmatrix.com/boxes-supported?branch=/branches/base-py3-6065

[exarkun]

Thanks.

1. DelayedCallTests in twisted.test.test_internet belongs somewhere else I think. twisted.internet.test.test_time? Or twisted.internet.test.test_base (only because, perhaps, it's something of a stretch for an interface test).
2. What about twisted.internet.test.test_base? That seems like an important part of porting twisted.internet.base...
3. Some of the process code in twisted.internet.base looks like it won't work on Python 3 - it uses unicode but doesn't import twisted.python.compat.unicode. Perhaps that's fine for now, since porting process support does seem like a fairly separate task. So maybe this ticket is just "port some of twisted.internet.base".
4. Maybe TestProducer._dontPausePullConsumerTest should have a docstring now, at least documenting the allowed values for methodName.

[itamarst]

(In [36027]) Address review comments. Refs #6065

[itamar]

1. That already had a test for this, so just deleted one I added.
2. Oops. Added.
3. I updated the test description to note that it doesn't include process code, and I reverted the changes I made to process code in base.
4. Added.

Ready for review, I think:  http://buildbot.twistedmatrix.com/boxes-supported?branch=/branches/base-py3-6065

[exarkun]

1. The pass in the body of nothing in test_base.py is unneeded. Hooray docstrings.
2. There's a merge conflict in the howto.

Otherwise looks good. Please merge when these are addressed.

[itamarst]

(In [36077]) Branching to 'base-py3-6065-2'

[itamarst]

(In [36081]) Merge base-py3-6065-2.

Author: itamar Review: exarkun Fixes: #6065

Port twisted.internet.base to Python 3.