[IM] Adding form Fanout port form element into physical Interface add edit form. Part of IXP-4
[IM] Updating proxies
[NF] Adding function getRelatedInterface wich returns FanoutPhysicalInterface if you call it from PeerPhysicalInterface and vice verse
[IM] Including TYPE FANOUT to get it in the list when editing physical interface.
[NF] Linking a fanout port to a physical interface. Part if IXP-4