framework: Add selinux_permissive_for_test context manager

[aborah-sudo]

Add context manager to BaseLinuxHost that temporarily sets SELinux to permissive mode for tests. This is needed for proxy provider tests that use nslcd (nss-pam-ldapd), as this test-only configuration lacks proper SELinux policies in enforcing mode.

[gemini-code-assist]

Summary of Changes

Hello @aborah-sudo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds a new context manager to the BaseLinuxHost class, designed to temporarily switch SELinux to permissive mode for specific test scenarios. This is particularly useful for proxy provider tests that rely on nslcd and encounter failures due to missing SELinux policies in enforcing mode. The context manager ensures that the SELinux state is safely restored after the test, providing a controlled environment for these sensitive tests.

Highlights

• New Context Manager: Introduced a new context manager, selinux_permissive_for_test, within the BaseLinuxHost class.
• SELinux Mode Control: This context manager temporarily sets SELinux to permissive mode for the duration of its block and ensures it is reverted to enforcing mode afterwards, if it was originally enforcing.
• Test Environment Support: The feature addresses issues in proxy provider tests that use nslcd (nss-pam-ldapd), which lack proper SELinux policies in enforcing mode, allowing these tests to run successfully.

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[gemini-code-assist]

Code Review

This pull request introduces a helpful context manager to temporarily set SELinux to permissive mode during tests. The implementation is straightforward and correctly handles scenarios where SELinux is not in enforcing mode. My review includes one suggestion to enhance the robustness of the cleanup logic, ensuring that a failure to restore the SELinux state doesn't halt the entire test suite.

[jakub-vavra-cz]

LGTM.