dhcpv6: run only for masquerade
dhcpv6: run only for masquerade

The VIF contains the information passed to the dhcp server.
If the VIF doesn't have ipv6 information, dhcpv6 won't run.

Currently, only masquerade binding sets ipv6 information on the VIF
since ipv6 is not supported for bridge binding.


Signed-off-by: Alona Kaplan <9ea2f88c7fe7e68aa51858b03e0d548211901b83@redhat.com>

davidvossel/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt