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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 its cardinality.

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


1/ 1:{0,1} (at most one instance of particular device can be configured
            per particular node)

   - fence_sanlock
   - virt related "proxy" agents (?)


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

   * 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 fence instances will per node and fence device will be
enforced.

As per Marek:

Following assumes "action" is the same.

- error:
  - sanlock

- warning:
  - virt, xvm, wmware_soap, ... (virtualization)
    - if IP the same + name is the same
  - ilo, ipmilan, drac, drac5, kdump, alom, rsa, rsb
    (port-less, see >>ack -vl "\"port\""<<)
    - if IP the same
  - scsi
  - others
    - IP and plug the same

confirming RSA, RSB should be in same category as ilo/drac