realmd: Adding new methods and rearrange code

[shridhargadekar]

Adding new methods:

1. permit
2. deny
3. renew

Adding a private helper function to execute commands to remove redundant code lines,
Updating the doc-string.

The renew method is available in newer version only.

[gemini-code-assist]

Summary of Changes

Hello @shridhargadekar, 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 significantly enhances the RealmUtils class by introducing new capabilities for managing user permissions (permit, deny) and renewing host keytabs (renew). It also improves code maintainability and readability through the introduction of a private helper function, _exec_realm, which consolidates common command execution logic, and by updating docstrings and type hints for better clarity.

Highlights

• New Realm Management Methods: Introduced permit, deny, and renew methods to the RealmUtils class, expanding its functionality for user access control and keytab management.
• Code Refactoring with Helper Function: A new private helper method, _exec_realm, was added to centralize the execution logic for realm commands, reducing redundancy in join, leave, and renew methods.
• Enhanced Type Hinting and Docstrings: Updated imports to support advanced type hinting and revised docstrings across the class for improved clarity and consistency.

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[gemini-code-assist]

Code Review

This pull request introduces new methods (permit, deny, renew) to RealmUtils and refactors existing methods (join, leave) to use a new private helper _exec_realm. This is a good change that reduces code duplication. The new methods are well-implemented. My review includes a few suggestions to improve the docstrings for clarity and correctness, particularly regarding a signature change in the leave method and some terse descriptions.

[ikerexxe]

See inline comments

[ikerexxe]

LGTM!