Ensure that copy_edge_attr_from will only copy attributes from edges which are common to the two graphs
* Allow the server nodes (and by extension all l3devices) to be real netkit VM's
* Make the start of the zebra daemon optional (only if one of its component is in use)
* Made sure that the debug flag for BGP was only set if BGP was enabled in the node
Add anycast dns resolver support on ANK side, anycast ip's have yet to handled
added anycast ip attribute
start zebra only if the node needs it (is a router at the moment)
Merge branch 'device_type_server' into anycast_dns_resolver
hostname is now independent from zebra
Merge pull request #119 from oliviertilmans/device_type_server

(Fix Issue #117) Using Any other non router l3device node (i.e. server) crashes ANK