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/intent/impl/IntentDataClockManager.java b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataClockManager.java
index 1c4ffbf..d828988 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataClockManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataClockManager.java
@@ -18,7 +18,7 @@
 import org.onosproject.net.intent.IntentData;
 import org.onosproject.store.Timestamp;
 import org.onosproject.store.service.ClockService;
-import org.onosproject.store.impl.MultiValuedTimestamp;
+import org.onosproject.store.service.MultiValuedTimestamp;
 
 /**
  * ClockService that uses IntentData versions as timestamps.