vlan:Minor Fixes

=>Get the dhcp value from the conf File for the vlan interface.
=>Assign the mac address of the parnt interface to vlan interface.
=>Create the ipv6 child ip objects once create the vlan interface.

Change-Id: I1d73fb18f9d300cbdcf94c73f06df2ea4a1d019b
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/vlan_interface.cpp b/vlan_interface.cpp
index 88e3c10..acf66db 100644
--- a/vlan_interface.cpp
+++ b/vlan_interface.cpp
@@ -32,6 +32,7 @@
 {
     id(vlanID);
     VlanIface::interfaceName(EthernetInterface::interfaceName());
+    mACAddress(parentInterface.mACAddress());
 
     Interfaces::emit_object_added();
 }