[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/KafkaCodecRegistrator.java b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaCodecRegistrator.java
index 4af3f50..4ab9a0d 100644
--- a/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaCodecRegistrator.java
+++ b/apps/kafka-integration/app/src/main/java/org/onosproject/kafkaintegration/impl/KafkaCodecRegistrator.java
@@ -15,11 +15,11 @@
  */
 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.Deactivate;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
+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.onosproject.codec.CodecService;
 import org.onosproject.kafkaintegration.api.dto.EventSubscriber;
 import org.slf4j.Logger;
@@ -32,7 +32,7 @@
 public class KafkaCodecRegistrator {
     private static Logger log = LoggerFactory.getLogger(KafkaCodecRegistrator
                                                                 .class);
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CodecService codecService;
 
     @Activate