[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DhcpUi.java b/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DhcpUi.java
index 0369dde..908099c 100644
--- a/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DhcpUi.java
+++ b/apps/dhcp/app/src/main/java/org/onosproject/dhcp/impl/DhcpUi.java
@@ -16,16 +16,15 @@
 package org.onosproject.dhcp.impl;
 
 import com.google.common.collect.ImmutableList;
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.apache.felix.scr.annotations.Service;
 import org.onosproject.ui.UiExtension;
 import org.onosproject.ui.UiExtensionService;
 import org.onosproject.ui.UiMessageHandlerFactory;
 import org.onosproject.ui.UiView;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -36,14 +35,13 @@
 /**
  * Mechanism to stream data to the GUI.
  */
-@Component(immediate = true, enabled = true)
-@Service(value = DhcpUi.class)
+@Component(immediate = true, service = DhcpUi.class)
 public class DhcpUi {
 
     private final Logger log = LoggerFactory.getLogger(getClass());
     private static final ClassLoader CL = DhcpUi.class.getClassLoader();
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected UiExtensionService uiExtensionService;
 
     private final UiMessageHandlerFactory messageHandlerFactory =