[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/cli/UiViewListCommand.java b/web/gui/src/main/java/org/onosproject/ui/impl/cli/UiViewListCommand.java
index cea67a0..b72210c 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/cli/UiViewListCommand.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/cli/UiViewListCommand.java
@@ -18,7 +18,7 @@
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ArrayNode;
-import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.api.action.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.ui.UiExtension;
 import org.onosproject.ui.UiExtensionService;
@@ -35,7 +35,7 @@
     private static final String FMT = "id=%s, category=%s, label=%s, icon=%s";
 
     @Override
-    protected void execute() {
+    protected void doExecute() {
         UiExtensionService service = get(UiExtensionService.class);
         if (outputJson()) {
             print("%s", json(service.getExtensions()));