Enable checkstyle check for newline at the end of
source files and fix the errors found.

Change-Id: If1c8eb2127d2f2394157750e6bae7b94169c6bc4
diff --git a/src/main/java/net/onrc/onos/core/datastore/IKVTable.java b/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
index 2260ad0..95e0027 100644
--- a/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
+++ b/src/main/java/net/onrc/onos/core/datastore/IKVTable.java
@@ -108,4 +108,4 @@
      * @return entries in this table.
      */
     public Iterable<IKVEntry> getAllEntries();
-}
\ No newline at end of file
+}