1a0d953737
In the Ocata release, the physical_network field of ports did not exist. The safest thing to do is to simply ignore it in this case. It is also possible for the local_link_connection fields to not have switch_id, switch_info or port_id attributes, so we now use .get(attr) to avoid an attribute lookup error. Change-Id: Ib4829dbd89fcedc121f493d6af76702421b399f7 TrivialFix