fcoe vdsm hook
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This hook allow to configure one or more NICs as FCoE interface(s)

Intallation:
* Use engine-config to append the appropriate custom property:
  engine-config -s UserDefinedNetworkCustomProperties='fcoe=^((enable|dcb|auto_vlan)=(yes|no),?)*$'

* Verify that custom property was added:
  engine-config -g UserDefinedNetworkCustomProperties

* Restart the engine

Usage:
* Define virtual network for FCoE
* Under "setup host networks" attach (drag) it to interface.
* Click small "Edit" button
    - To enable FCoE add fcoe property with value in following format:
        "enable=yes[,dcb=yes][,auto_vlan=yes]" or left it blank for default values
* Click small "Edit" button and add fcoe property with value "true"
* To disable FCoE delete custom propery or change "enable" value to "no"
