Simplify init-runonce boot command

openstack cli now supports --network foo rather than having to find the
network uuid. Thanks to mgoddard for the tip.

Change-Id: I9ce94a86c6950b81ef3ec70fe10ee565cc1f1171

tools/init-runonce

@@ -128,8 +128,6 @@ if ! openstack flavor list | grep -q m1.tiny; then
     openstack flavor create --id 5 --ram 16384 --disk 160 --vcpus 8 m1.xlarge
 fi
 
-DEMO_NET_ID=$(openstack network list | awk '/ demo-net / {print $2}')
-
 cat << EOF
 
 Done.
@@ -140,6 +138,6 @@ openstack server create \\
     --image ${IMAGE_NAME} \\
     --flavor m1.tiny \\
     --key-name mykey \\
-    --nic net-id=${DEMO_NET_ID} \\
+    --network demo-net \\
     demo1
 EOF