Adding integration tests for Network (aka Neutron)

Need to add integration tests for:
* [x] Creating a network
* [x] Getting networks
* [x] Getting a network
* [x] Updating a network
* [x] Deleting a network
* [x] Creating a subnet
* [x] Getting subnets
* [x] Getting a subnet
* [x] Updating a subnet
* [x] Deleting a subnet
* [x] Creating a port
* [x] Getting ports
* [x] Getting a port
* [x] Updating a port
* [x] Deleting a port