nfs-mount-monitor: escalate to reboot after N consecutive fix_mount failures

Persist a consecutive-failure counter to /var/lib/nfs-mount-monitor/fail-count.
Increment on every fix_mount failure; reset to 0 on any successful repair or
when all three probes pass cleanly. After NFS_FAIL_THRESHOLD (default 5, ~50s)
consecutive failures the node is cordoned via kubectl and rebooted with
'systemctl reboot' so the cluster stops routing pods to a silently broken node.

NFS_FAIL_THRESHOLD is configurable via /etc/default/nfs-mount-monitor (deployed
as EnvironmentFile in the .service unit) without touching the script.

Also fix Rexfile path resolution: __FILE__ inside a Rex task resolves to the
internal Rex loader path, not the Rexfile itself; use realpath($::rexfile)
instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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