VirtualNetworkManager.get does not return existing service class

VirtualNetworkManager maintains a map of network-specific services, which a user can obtain via VirtualNetworkService.get(NetworkId networkId, Class<T> serviceClass);

The first time the get method is invoked for a specific network and service class combination, an instance is created and stored so that subsequent "get" invocations will return the existing service class instance.

This is currently not happening - all "get" invocations will result in new instances of the service class being created. As a result, error "Error executing command: Store delegate already set" is seen during testing.