Replace uses of imp.find_module / imp.load_module with importlib in the importer

[Julian]

As of 3.3, these functions are deprecated in favor of importlib implementations, which also happen to properly respect path hooks.

This is interfering with a thing I'm writing, so if I get a moment hopefully a pull request will be incoming (without breaking backwards compat obviously).

[wli]

Bumping this, as this is the only warning in my project when running in python -Wd mode under python 3.6.3.

Warning looks like this:

lib/python3.6/site-packages/nose/importer.py:12: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
  from imp import find_module, load_module, acquire_lock, release_lock

[Michael-E-Rose]

I am currently working on this. Luckily find_module() and load_module() have a replacement. acquire_lock() and release_lock() however don't. We could use threading instead?

[snstanton]

Has there been any progress on this? Do we still need the acquire_lock calls given importlib does locking internally? If the locks are just being used to guard local state, then using the threading module seems like the better strategy.

[mdmintz]

This has been fixed in https://github.com/mdmintz/pynose/releases/tag/v1.4.3 using the code from @chugcup (https://github.com/chugcup/nose/commit/67654c89b17a302763f57feea0abc4fba3ad2322).

pynose in the new maintained nose.

https://github.com/mdmintz/pynose --- https://pypi.org/project/pynose/