Moved generic Timestamp/ClockManager classes to onos-api
so they are usable by applications.

Change-Id: Icf0e92d12434dec782332e91b632da8066a85b60
diff --git a/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java b/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
index c46131e..f03215d 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/ecmap/EventuallyConsistentMapImpl.java
@@ -35,7 +35,7 @@
 import org.onosproject.store.cluster.messaging.MessageSubject;
 import org.onosproject.store.impl.LogicalTimestamp;
 import org.onosproject.store.impl.Timestamped;
-import org.onosproject.store.impl.WallClockTimestamp;
+import org.onosproject.store.service.WallClockTimestamp;
 import org.onosproject.store.serializers.KryoSerializer;
 import org.onosproject.store.service.ClockService;
 import org.onosproject.store.service.EventuallyConsistentMap;