Complete net-show/net-list/subnet-list/subnet-show

Clean up and improve the neutron network/subnet list/show response body to make it openstack
compatible.

Change-Id: I0047c14eee758c1a283cdc53757544c45994faf3
via http://sldn.softlayer.com/reference/datatypes/SoftLayer_Network_Vlan

The networkSpace attribute is probably what you want to use instead of pulling back every public network VLAN.