vlan_interface: Remove interface name usage

This makes it possible to remove from the dbus interface completely.

Change-Id: I7e572306e75b8494a72a9a2b8bf2ceece6ab168c
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/vlan_interface.cpp b/src/vlan_interface.cpp
index efd1341..9f92198 100644
--- a/src/vlan_interface.cpp
+++ b/src/vlan_interface.cpp
@@ -28,7 +28,6 @@
     parentInterface(intf)
 {
     id(vlanID);
-    VlanIface::interfaceName(EthernetInterface::interfaceName());
     MacAddressIntf::macAddress(parentInterface.macAddress());
 
     emit_object_added();