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+++ This bug was initially created as a clone of Bug #906016 +++

Currently, luci is too liberate in terms of what configuration can be
achieved using it.

This bugs is to closely examine the semantically correct relationship
between fence and unfence per-node configuration, specifically
the requirement to have unfence section configured whenever particular
fence agent is referenced.

Applying this view, three categories seem to exist, very rough estimatation
of which follows:


1/ unfence is mandatory (sane to have it configured)

   - sanlock
   - sanbox2, ifmib, cisco_mds (?)


2/ unfence is optional

   - ?

3/ unfence does not make sense

   - ?


When the exact situation is mapped, the result of this RFE will be
less space for semantically incorrect configuration as the correct
relationship between fence and unfence per-node configuration will
be enforced.

update to 1/:

- sanlock, scsi (with these, unfence is actually enforced as a part
  of [bug 877098] fix)
- sanbox2, ifmib, cisco_mds (?)

As per Marek:

- warning:
  - fabric fencing within fence block, but not within respective
    unfence block (per node)

Note this complements the property examined in [bug 907470]
(see fabric switches).