hacking H306 from-style

[zoumingzhe]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [ ] This doc is inaccurate in this way: ______
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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isort to sort from-style imports alphabetically, such as:
```
from a import c
from a.b import d
```

run flake8 will report: "H306: imports not in alphabetical order (a.c, a.b.d)"

-----------------------------------
Release: on 2018-06-28 14:25:50
SHA: e8a3a7eb967891d6874cfdc25dcea826dbf9bfd4
Source: https://opendev.org/openstack/project-team-guide/src/doc/source/bugs.rst
URL: https://docs.openstack.org/project-team-guide/bugs.html

[zoumingzhe (mingzhebaosheng)]

H306 seems to convert from-style to straight-style

[Ghanshyam Mann (ghanshyammann)]

we have a few feedback on the change proposed in gerrit https://review.opendev.org/c/openstack/hacking/+/882990

I do not think we can or should do this change as it is a almost changing in all the OpenStack projects and not finding what value it will add.

Instead of invalid we should mark it as 'Won't Fix'

[melanie witt (melwitt)]

Aside from the fact that this would require a very large number of changes in all projects, I don't see how the existing behavior is incorrect.

That is, the example given in comment 0:

from a import c
from a.b import d

is correctly identified as not in alphabetical order because each import does indeed represent the modules a.c and a.b.d respectively.

IMHO this bug is Invalid and I don't know the reasoning behind why https://isort.readthedocs.io considers the above example to be correct alphabetical ordering of module imports.