nat_pass property was introduced by feature ROUTER_FIREWALL, it has
been deprecated since 4.0.1. Remove the property if nsxt version
is greater than 4.0.1
Change-Id: Icba4ff4139fc8ac3502e2c633637582e075faa38
(cherry picked from commit 9523d737ba9ce061131d6c9c2b36f31c23cb44bb)