[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/cli/src/main/java/org/onosproject/cli/PrettyXml.java b/cli/src/main/java/org/onosproject/cli/PrettyXml.java
index 9b3635f..20c8180 100644
--- a/cli/src/main/java/org/onosproject/cli/PrettyXml.java
+++ b/cli/src/main/java/org/onosproject/cli/PrettyXml.java
@@ -18,7 +18,8 @@
 import java.io.IOException;
 import java.io.InputStreamReader;
 
-import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.api.action.Command;
+import org.apache.karaf.shell.api.action.lifecycle.Service;
 import org.onlab.util.XmlString;
 
 import com.google.common.io.CharStreams;
@@ -26,12 +27,13 @@
 /**
  * Pretty print previous command output XML.
  */
+@Service
 @Command(scope = "onos", name = "ppxml",
          description = "Pretty print XML output from previous command")
 public class PrettyXml extends AbstractShellCommand {
 
     @Override
-    protected void execute() {
+    protected void doExecute() {
         try {
             String xmlS = CharStreams.toString(new InputStreamReader(System.in));