Add available params in networks client's comment
Add available params in networks client's comment

Some interfaces in networks client have **kwargs parameter, but no api
reference links are given. so this is to add "Available params" in their
comments.

Change-Id: I34a8bbe92326f1f37554838a00932aaf712b2a33

sebrandon1/tempest,openstack/tempest,masayukig/tempest,Juniper/tempest,cisco-openstack/tempest,openstack/tempest,Tesora/tesora-tempest,sebrandon1/tempest,masayukig/tempest,Tesora/tesora-tempest,vedujoshi/tempest,Juniper/tempest,cisco-openstack/tempest,vedujoshi/tempest