[r=allenap][bug=1383237][author=gmb] Update the error message returned by the API when trying to reserve an IP on an interface with no static range defined.
Previously, the error claimed there was no such network, but the actual problem is that we exclude interfaces without a static range from our search for networks from which to reserve an IP. The message now suggests that you may be trying to reserve an address on a network with no static range.