Update nfs config for image mode

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Summary by CodeRabbit

• New Features
  • NFS mount source and export options now automatically adjust based on the system's mode, providing improved compatibility with systems running in image mode.

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📝 Walkthrough

Walkthrough

A new function, is_image_mode(), was introduced in virttest/nfs.py to detect if the system is running in image mode using the rpm-ostree status command. The Nfs class constructor was updated to conditionally set mount_src and export_options based on the detected system mode.

Changes

Cohort / File(s)	Change Summary
Image Mode Detection & NFS Adjustment virttest/nfs.py	Added is_image_mode() function to check system mode via rpm-ostree status. Modified Nfs.__init__ to set mount_src and export_options based on image mode status, with logging for each case.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~7 minutes

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