Use provider net on OSIC

We can attach our instances directly to the new public provider net
rather than using floating IPs. Switch over to this as it will eliminate
the need for FIP managment which is leaky.

Change-Id: Ia3e01c18b22c01ac9fa9caa4885811ce58d7eb86

nodepool/nodepool.yaml

@@ -612,8 +612,9 @@ providers:
     boot-timeout: 120
     max-servers: 100
     rate: 0.001
-    pool: 'GATEWAY_NET'
-    clean-floating-ips: true
+    networks:
+      - name: 'GATEWAY_NET'
+        public: True
     images:
       - name: ubuntu-precise
         min-ram: 8000