test: comment out NFS mounts from /etc/fstab for bootable test failures

[richm]

Due to snapshotmanager/snapm#955 and due to the NFS
mounts on our test machines, the bootable tests are failing. Comment out
the NFS mounts from /etc/fstab.

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Temporarily disable NFS entries in /etc/fstab during tests to prevent bootable test failures and restore them afterward.

New Features:

• Capture and expose original uncommented NFS /etc/fstab lines as a test fact for later restoration.

Enhancements:

• Extend test setup to detect and comment out active NFS and NFS4 fstab entries before running tests.
• Extend test cleanup to restore previously commented NFS fstab entries to their original state.

[sourcery-ai]

Reviewer's Guide

This PR updates the test setup and cleanup Ansible tasks to temporarily comment out active NFS entries in /etc/fstab during bootable tests and restore them afterward, preventing NFS-related boot failures on test machines.

File-Level Changes

Change	Details	Files
Temporarily comment out NFS entries in /etc/fstab during tests and restore them in cleanup to avoid NFS-related boot failures.	Extend setup task facts to include a snapshot_fstab_nfs_lines variable to track original uncommented NFS fstab lines. Scan /etc/fstab for uncommented NFS/nfs4 entries, store them in snapshot_fstab_nfs_lines, and generate a temporary fstab with those lines commented out using awk. Overwrite /etc/fstab during setup with the computed version that has NFS lines commented while preserving file permissions and ownership. Add cleanup logic that loops over snapshot_fstab_nfs_lines and uses a replace task to uncomment the corresponding lines in /etc/fstab, guarded by a length check to avoid running when no NFS lines were modified.	tests/tasks/setup.yml tests/tasks/cleanup.yml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[richm]

[citest]

[trgill]

looks good