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>
3 files changed