Do not pre-config DHCP option_list length
Do not pre-config DHCP option_list length

Change-Id: I16e881575b1e418fac27415739d3794b4582759f

openstack/dragonflow,neoareslinux/dragonflow,FrankDuan/df_code,FrankDuan/df_code,openstack/dragonflow,FrankDuan/df_code,openstack/dragonflow,neoareslinux/dragonflow