T2295: vyos_user: quote plaintext-password in generated set commands (#480)

* vyos_user: quote plaintext-password in generated set commands

VyOS requires quoted values for passwords with special characters.
Align with encrypted-password and integration test conventions.

Co-authored-by: Cursor <cursoragent@cursor.com>

* T2295: escape plaintext-password values in vyos_user set commands

Quote passwords for VyOS special-character handling and escape embedded
single quotes. Update RETURN sample, add unit tests, refresh changelog.

Co-authored-by: Cursor <cursoragent@cursor.com>

* T2295: shorten changelog fragment for ansible-lint line-length

Co-authored-by: Cursor <cursoragent@cursor.com>

* T2295: use shlex.quote() for plaintext-password values

Replace custom _quote_config_value() with stdlib shlex.quote() per
review feedback; update unit tests and RETURN sample accordingly.

Co-authored-by: Cursor <cursoragent@cursor.com>

* T2295: add complex plaintext-password quoting unit test

Cover spaces, shell metacharacters, embedded quotes, and backslashes in
one password; assert command output matches shlex.quote().

Co-authored-by: Cursor <cursoragent@cursor.com>

* T2295: assert explicit quoting in complex password unit test

Replace shlex.quote()-derived expectation with a fixed command string,
matching the other password quoting tests.

Co-authored-by: Cursor <cursoragent@cursor.com>

* Fix RETURN doc sample, add docstrings and workflow permissions

- RETURN sample was missing the username token in the example command
- Add docstrings to all undocumented module-level functions to bring
  docstring coverage above the 80% threshold
- Add explicit permissions: contents: read to codecoverage.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Revert "Fix RETURN doc sample, add docstrings and workflow permissions"

This reverts commit 827809ee49cf472a8bf30ec0b24d347a75fcb083.

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Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: omnom62 <75066712+omnom62@users.noreply.github.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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