Optional parameters in Subnet(s) Response Parameters tables.
Optional parameters in Subnet(s) Response Parameters tables.

Related-link: Neutron subnets
http://developer.openstack.org/api-ref-networking-v2.html#subnets
This patch change "tenant_id" and "host_routes" parameters from
Optional to required in the Subnet(s) Response parameters tables.

Change-Id: If48edf2a450c8696e4feeeec873cc58fa32efac3
Closes-Bug: #1553846

openstack/api-site,Tesora/tesora-api-site,openstack/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,Tesora/tesora-api-site,openstack/api-site,Tesora/tesora-api-site,openstack/api-site