[WIP] Add @Service tags to all commands and completers

Change-Id: I8d6ae6185ada30a92481ddb7b603af323656dc3a
diff --git a/providers/null/src/main/java/org/onosproject/provider/nil/cli/CreateNullEntity.java b/providers/null/src/main/java/org/onosproject/provider/nil/cli/CreateNullEntity.java
index a9efa78..237c79d 100644
--- a/providers/null/src/main/java/org/onosproject/provider/nil/cli/CreateNullEntity.java
+++ b/providers/null/src/main/java/org/onosproject/provider/nil/cli/CreateNullEntity.java
@@ -17,6 +17,7 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.primitives.Longs;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
 import org.onlab.util.Tools;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.net.ConnectPoint;
@@ -33,6 +34,7 @@
 /**
  * Base command for adding simulated entities to the custom topology simulation.
  */
+@Service
 public abstract class CreateNullEntity extends AbstractShellCommand {
 
     protected static final String GEO = "geo";