Addresses #75
Addresses #75

Adds optional bulk read of subnets through ports. Fixes the previous
patch by allowing network_id and tenant_id to always be shown,
regardless of fields passed.

roaet/quark,Cerberus98/quark,lmaycotte/quark,Cerberus98/quark,insequent/quark,asadoughi/quark,lmaycotte/quark,alanquillin/quark,insequent/quark,alanquillin/quark,rackerlabs/quark,rackerlabs/quark,roaet/quark,asadoughi/quark