[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaStorageManager.java b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaStorageManager.java
index 19e58ca..138db2b 100644
--- a/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaStorageManager.java
+++ b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaStorageManager.java
@@ -15,12 +15,6 @@
  */
 package org.onosproject.kafkaintegration.impl;
 
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Service;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.onosproject.kafkaintegration.api.KafkaEventStorageService;
 import org.onosproject.kafkaintegration.api.dto.OnosEvent;
 import org.onosproject.store.serializers.KryoNamespaces;
@@ -28,17 +22,21 @@
 import org.onosproject.store.service.StorageService;
 import org.onosproject.store.service.Task;
 import org.onosproject.store.service.WorkQueue;
+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;
 
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 
-@Component(immediate = false)
-@Service
+@Component(service = KafkaEventStorageService.class)
 public class KafkaStorageManager implements KafkaEventStorageService {
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected StorageService storageService;
 
     private final Logger log = LoggerFactory.getLogger(getClass());