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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 devices and their instances, specifically ... the sharedness
of fence device (whether the single fence device can be used/instantied/
referred at single node only or is by principle shared amongst many
nodes).

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


1/ {0,1}:{0,1} (at most one node can used the particular device)

   - fence_ilo and the like


2/ 1:M (deliberate number of nodes ...)

   * the instances are often distinguished by "discriminator",
     e.g., port number (?)


When the exact situation is mapped, the result of this RFE will be
less space for semantically incorrect configuration as the correct
range of nodes using particualr fence device will be enforced.

As per Marek:

- error:
  - ilo, ipmilan, drac, drac5, kdump, alom, rsa, rsb
    (port-less, see >>ack -vl "\"port\""<<)
    - if IP the same

- warning:
  - all others if IP/port and particular plug is used by
    several nodes