[3006.x] Fix salt user login shell path in Debian packages

[clayoster]

There are cases where /sbin/nologin doesn't exist on Debian servers. This will set /usr/sbin/nologin on new installs and update it on existing installs during the next upgrade as well.

What does this PR do?

What issues does this PR fix or reference?

Fixes: #64377

Previous Behavior

In cases where /sbin/nologin doesn't exist on Debian servers, running salt-master -l debug will fail because the login shell is not available.

New Behavior

The "salt" user login shell will be set to /usr/sbin/nologin which is the Debian default.

Merge requirements satisfied?

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

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

Commits signed with GPG?

Yes

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[clayoster]

I noticed one of the CI checks was failing because there was no newline in the changelog file. Added commit 58dd833 to fix that.

[dwoz]

We should have some kind of regression test for this.

[dwoz]

We should have some kind of regression test for this.

[welcome]

Congratulations on your first PR being merged! 🎉

[s0undt3ch]

💚 All backports created successfully

Status	Branch	Result
✅	3006.x

Questions ?

Please refer to the Backport tool documentation

[github-actions]

💔 All backports failed

Status	Branch	Result
❌	complete	The branch "complete" does not exist

Manual backport

To create the backport manually run:

backport --pr 64378

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details