When creating a portgroup provider natwork, the name of the neutron
network should match the name of the virtual wire.
Commit Ib5ed8f0d75aed98963e1deff9c123ee01afc875c removed the network
name from the code by mistake
Change-Id: I1c9bf57d3fefde0c9ec9370628a8b5bbc92b783f