[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/core/net/src/main/java/org/onosproject/cluster/impl/MastershipProxyManager.java b/core/net/src/main/java/org/onosproject/cluster/impl/MastershipProxyManager.java
index 96cbe3a..41f11d9 100644
--- a/core/net/src/main/java/org/onosproject/cluster/impl/MastershipProxyManager.java
+++ b/core/net/src/main/java/org/onosproject/cluster/impl/MastershipProxyManager.java
@@ -15,6 +15,27 @@
  */
 package org.onosproject.cluster.impl;
 
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+import org.onlab.util.OrderedExecutor;
+import org.onlab.util.Tools;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.mastership.MastershipProxyFactory;
+import org.onosproject.mastership.MastershipProxyService;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.Serializer;
+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.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 import java.util.Map;
@@ -27,28 +48,6 @@
 import java.util.concurrent.Executors;
 import java.util.function.Function;
 
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Maps;
-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.onlab.util.OrderedExecutor;
-import org.onlab.util.Tools;
-import org.onosproject.cluster.ClusterService;
-import org.onosproject.cluster.NodeId;
-import org.onosproject.mastership.MastershipProxyFactory;
-import org.onosproject.mastership.MastershipProxyService;
-import org.onosproject.mastership.MastershipService;
-import org.onosproject.net.DeviceId;
-import org.onosproject.store.cluster.messaging.ClusterCommunicationService;
-import org.onosproject.store.serializers.KryoNamespaces;
-import org.onosproject.store.service.Serializer;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import static com.google.common.base.Preconditions.checkArgument;
 import static org.onlab.util.Tools.groupedThreads;
 
@@ -58,8 +57,7 @@
  * This implementation wraps both the proxy service and the generated proxy instance in additional proxies which check
  * mastership and route calls to the appropriate proxy instances.
  */
-@Component(immediate = true)
-@Service
+@Component(immediate = true, service = MastershipProxyService.class)
 public class MastershipProxyManager extends AbstractProxyManager implements MastershipProxyService {
 
     private static final Serializer REQUEST_SERIALIZER =
@@ -68,13 +66,13 @@
 
     private final Logger log = LoggerFactory.getLogger(getClass());
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected MastershipService mastershipService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterService clusterService;
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected ClusterCommunicationService clusterCommunicator;
 
     private final ExecutorService proxyServiceExecutor =