[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/apps/vtn/sfcweb/src/main/java/org/onosproject/sfcweb/SfcwebUiTopovComponent.java b/apps/vtn/sfcweb/src/main/java/org/onosproject/sfcweb/SfcwebUiTopovComponent.java
index 049efbb..ddd6fa2 100644
--- a/apps/vtn/sfcweb/src/main/java/org/onosproject/sfcweb/SfcwebUiTopovComponent.java
+++ b/apps/vtn/sfcweb/src/main/java/org/onosproject/sfcweb/SfcwebUiTopovComponent.java
@@ -16,11 +16,11 @@
 package org.onosproject.sfcweb;
 
 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.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.ui.UiExtension;
 import org.onosproject.ui.UiExtensionService;
 import org.onosproject.ui.UiMessageHandlerFactory;
@@ -43,7 +43,7 @@
 
     private final Logger log = LoggerFactory.getLogger(getClass());
 
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected UiExtensionService uiExtensionService;
 
     // List of application views