Added a function to the registry to allocate a block of numbers unique within the whole cluster using Curator's DistributedAtomicLong
diff --git a/src/main/java/net/onrc/onos/registry/controller/IControllerRegistryService.java b/src/main/java/net/onrc/onos/registry/controller/IControllerRegistryService.java
index dadee65..21da47e 100644
--- a/src/main/java/net/onrc/onos/registry/controller/IControllerRegistryService.java
+++ b/src/main/java/net/onrc/onos/registry/controller/IControllerRegistryService.java
@@ -115,4 +115,7 @@
 	 * @return Collection of dpids
 	 */
 	public Collection<Long> getSwitchesControlledByController(String controllerId);
+	
+	public IdBlock allocateUniqueIdBlock();
+	
 }