Force iptables forwarding commands to execute

[Ajay R (AjayMsft9)]

Description

Ensure that iptables rules used for remote libvirt guest SSH forwarding are executed every time instead of returning cached command results.

When DHCP assigns a new guest an IP address previously used by another guest, LISA may return the cached successful result of the earlier FORWARD command. Because the old rule was removed during cleanup, the required rule is missing and SSH to the new guest times out.

This change:

• Adds force_run=True to forwarding rule creation and cleanup commands.
• Adds a focused self-test covering cleanup and reuse of the same guest IP.

Related Issue

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Documentation update

Checklist

• Description is filled in above
• No credentials, secrets, or internal details are included
• Peer review requested (if not, add required peer reviewers after raising PR)
• Tests executed and results posted below

Test Validation

Key Test Cases:
smoke_test|verify_cpu_count

Impacted LISA Features:
None

Tested Azure Marketplace Images:

Test Results

Image	VM Size	Result
Local focused self-test	N/A	PASSED
Full LISA self-test suite: 271 tests	N/A	PASSED
flake8	N/A	PASSED

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