Warn for specific thread module methods

[nanjekyejoannah]

Dont merge until #13 and #14 are merged, some helper code cuts across.

This replaces #15

Threading module Notes

Python 2:

>>> from thread import get_ident
>>> from threading import get_ident
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name get_ident
>>> import threading
>>> from threading import _get_ident
>>>

Python 3:

>>> from threading import get_ident
>>> from thread import get_ident
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'thread'
>

Note:

There is no neutral way of porting

[nanjekyejoannah]

bors try

[bors]

try

Build succeeded:

• buildbot/buildbot-build-script

[ltratt]

Excellent!

bors r+

[bors]

Build succeeded:

• buildbot/buildbot-build-script