virtcontainers: Rely on new interface LinkType field

Now that Interface structure includes the useful information about
the type of interface, Kata does not need to do any assumption about
the type of interface that needs to be added.

Fixes #866

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

virtcontainers/sandbox.go

@@ -1098,13 +1098,6 @@ func (s *Sandbox) generateNetInfo(inf *types.Interface) (NetworkInfo, error) {
 		addrs = append(addrs, *netlinkAddr)
 	}
 
-	var ifaceType string
-	if s.config.NetworkConfig.InterworkingModel == NetXConnectNoneModel {
-		ifaceType = "tap"
-	} else {
-		ifaceType = "veth"
-	}
-
 	return NetworkInfo{
 		Iface: NetlinkIface{
 			LinkAttrs: netlink.LinkAttrs{
@@ -1112,7 +1105,7 @@ func (s *Sandbox) generateNetInfo(inf *types.Interface) (NetworkInfo, error) {
 				HardwareAddr: hw,
 				MTU:          int(inf.Mtu),
 			},
-			Type: ifaceType,
+			Type: inf.LinkType,
 		},
 		Addrs: addrs,
 	}, nil