[Python-modules-team] Mass filing on Python 3.7 async module import?

[Paul R. Tagliamonte]

Hey DPMT (BCC'ing -devel, let's keep conversaion on DPMT),

I see that Python 3.7 now raises a syntax error when you try to import
a module that is named `async`.

```
$ python3.6
Python 3.6.6 (default, Jun 27 2018, 14:44:17)
[GCC 8.1.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import foo.async
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'foo'
>>>
```

With Python 3.7:

```
$ python3.7
Python 3.7.0 (default, Jun 27 2018, 14:40:03)
[GCC 8.1.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import foo.async
  File "<stdin>", line 1
    import foo.async
                   ^
SyntaxError: invalid syntax
>>>
```

Quickly checking codesearch, there are a bunch of packages that have
import lines that look like they'd fail.

Anyone mind if I do a MBF on libraries that are providing anything
named `async.py`?

   Paul