Fix/wheel file roots find

[kevthehermit]

What does this PR do?

Adds subdir=True to wheel.file_roots.find

What issues does this PR fix or reference?

Fixes: #59800

Previous Behavior

When attempting to read a file in a subdirectory with wheel.file_roots.read it would fail as wheel.file_roots.find is not able to read from a subdirectory.

New Behavior

You can successfully read a file in a subdirectory

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltstack.com/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

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[Ch3LL]

This will require test coverage

[Ch3LL]

@dwoz would you mind reviewing here. Looks like this was changed here: d5801df

[dwoz]

While looking at the implementation of subdir=True, I am a bit confused

    if subdir:
        if real_path.startswith(real_root):
            return real_path
    else:
        if os.path.dirname(real_path) == os.path.normpath(real_root):
            return real_path

Why are we calling normpath in the else and not the subdir case?

[dwoz]

@dwoz would you mind reviewing here. Looks like this was changed here: d5801df

I approve provided we have tests.

[kevthehermit]

I didn't see any existing test in place for these modules to extend so will have to read up on tests and put something together

[sagetherage]

@waynew maybe a good candidate for the Test Clinic next Tuesday

[MKLeb]

This will close the corresponding issue with a comprehensive test suite: #64429.