Add IPv6 support for _move_neutron_addresses_route
Add IPv6 support for _move_neutron_addresses_route

Added functionallity to allow IPv6 addresses to be moved to the
OVS_PHYSICAL_BRIDGE from PUBLIC_INTERFACE automatically using
_move_neutron_addresses_route. Only PUBLIC_INTERFACE and
OVS_PHYSICAL_BRIDGE need to be set in localrc.

HOST_IP must be set in localrc. HOST_IPV6 must be set in localrc if a
global IPv6 address is configured on PUBLIC_INTERFACE.

Change-Id: I8d2c055702e1c7cf08499a77f6843393762fd4c1

HPCHub/devstack,thomasem/devstack,Mahito/devstack,j4/devstack,bigswitch/devstack,upadhyay-prashant/devstack,HPCHub/devstack,richliu/devstack,liuquansheng47/devstack,parul24/devstack,openstack-dev/devstack,richliu/devstack,herrsechs/devstack,nawawi/openstack,CloudServer/devstack,pczerkas/devstack,pacinete/devstack,Mahito/devstack,wenhuizhang/devstack,herrsechs/devstack,NaokiMiyata/devstack,samgoon/devstack,dirkmueller/devstack,costingalan/devstack,liuquansheng47/devstack,vishnugonela/devstack,avvocatodemarchis/devstack,bswartz/devstack,eharney/devstack,varunarya10/devstack,mssumanth/devstack,costingalan/devstack,pczerkas/devstack,prithivm/branch01,varunarya10/devstack,parul24/devstack,bigswitch/devstack,openstack-dev/devstack,noironetworks/devstack,CloudServer/devstack,avvocatodemarchis/devstack,vsham20/devstack,ozamiatin/devstack,bq-xiao/devstack,eharney/devstack,flavio-fernandes/devstack,nawawi/openstack,samgoon/devstack,olivierlemasle/devstack,pacinete/devstack,TwinkleChawla/devstack,mssumanth/devstack,upadhyay-prashant/devstack,ozamiatin/devstack,noironetworks/devstack,mmasaki/devstack,LoHChina/devstack,pombredanne/devstack,vishnugonela/devstack,mc2014/devstack,dtroyer/devstack,wenhuizhang/devstack,dtroyer/devstack,olivierlemasle/devstack,group-policy/devstack,atulpatil301/devstack,group-policy/devstack,NaokiMiyata/devstack,j4/devstack,mc2014/devstack,pombredanne/devstack,TwinkleChawla/devstack,atulpatil301/devstack,flavio-fernandes/devstack,bswartz/devstack,LoHChina/devstack,vsham20/devstack,mmasaki/devstack,bq-xiao/devstack,prithivm/branch01,thomasem/devstack,dirkmueller/devstack