Add unicode_literals import

[twangboy]

What does this PR do?

Fixes Unicode issues in the log.debug messages in the win_wua module

What issues does this PR fix or reference?

#30980

Previous Behavior

Failing with a stack trace with Unicode characters in the title.

Tests written?

No

[cachedout]

@twangboy Did you see the most recent comment here?

You may want to bring @cdunklau in on this.

[twangboy]

@cachedout I did, but it seemed to reference older versions of Python. Since Windows stays pretty current, I didn't think it was an issue. Shall I do the u'string' approach instead?

[cdunklau]

I'd love to help, but I know very little about the situation in Windows, or really in general when it concerns large projects... and since I know very, very little about the Salt codebase, I don't think I'll be of much help. I posted that comment mainly as a warning, I didn't intend it to be a hard "hey don't do this".

The issues caused by unicode_literals in polyglot code seem to revolve around certain Python APIs that expect the "native" str type in both versions, especially those dealing with paths.

Explicitly using bytes/unicode literals without unicode_literals lets one choose one or the other where appropriate, while still keeping the ability to use "native" str where necessary.

[damon-atkins]

This has been add to other windows execution modules from __future__ import unicode_literals
You can also use PY3 syntax to set the type.

There is also this recent change #40307 System encoding detection compatibility for windows