Add a network test that sets up 2 of 4 ehternet devices, and allows another to use dhcp

Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

vendor/github.com/vishvananda/netlink/socket.go

@@ -0,0 +1,27 @@
+package netlink
+
+import "net"
+
+// SocketID identifies a single socket.
+type SocketID struct {
+	SourcePort      uint16
+	DestinationPort uint16
+	Source          net.IP
+	Destination     net.IP
+	Interface       uint32
+	Cookie          [2]uint32
+}
+
+// Socket represents a netlink socket.
+type Socket struct {
+	Family  uint8
+	State   uint8
+	Timer   uint8
+	Retrans uint8
+	ID      SocketID
+	Expires uint32
+	RQueue  uint32
+	WQueue  uint32
+	UID     uint32
+	INode   uint32
+}