nova-net: Stop mocking the instance network cache

This has been tying us to nova-network. This should be a one line change
but it has a large knock-on effect due to lots of samples using it. We
just need to suck it up and deal with it, unfortunately.

Change-Id: I09c88e0fdf3635683c56901637fc3c0a9084d482
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

doc/api_samples/os-cloudpipe/cloud-pipe-get-resp.json

@@ -3,7 +3,7 @@
         {
             "created_at": "2012-11-27T17:18:01Z",
             "instance_id": "27deecdb-baa3-4a26-9c82-32994b815b01",
-            "internal_ip": "192.168.0.3",
+            "internal_ip": "192.168.1.30",
             "project_id": "fa1765bd-a352-49c7-a6b7-8ee108a3cb0c",
             "public_ip": "127.0.0.1",
             "public_port": 22,