Fixed a number of CLI commands.
Refactored the StoreService/Manager stuff for common serializer pool.
diff --git a/cli/src/main/java/org/onlab/onos/cli/net/DeviceRemoveCommand.java b/cli/src/main/java/org/onlab/onos/cli/net/DeviceRemoveCommand.java
index b4f2385..7cc55e6 100644
--- a/cli/src/main/java/org/onlab/onos/cli/net/DeviceRemoveCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/net/DeviceRemoveCommand.java
@@ -18,9 +18,8 @@
     String uri = null;
 
     @Override
-    protected Object doExecute() throws Exception {
+    protected void execute() {
         getService(DeviceAdminService.class).removeDevice(DeviceId.deviceId(uri));
-        return null;
     }
 
 }