Apply suggestion from @DaanHoogland

Author: DaanHoogland

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -255,7 +255,6 @@
 import com.cloud.network.Network.Provider;
 import com.cloud.network.Network.Service;
 import com.cloud.network.NetworkModel;
-import com.cloud.network.NetworkService;
 import com.cloud.network.Networks.TrafficType;
 import com.cloud.network.PhysicalNetwork;
 import com.cloud.network.as.AutoScaleManager;