Register BigDecimal to kryo fixing DCStore issue.

Change-Id: Ia6ee2bbcc813223c85b8c95885542044269a081b
diff --git a/apps/config/src/main/java/org/onosproject/config/impl/DistributedDynamicConfigStore.java b/apps/config/src/main/java/org/onosproject/config/impl/DistributedDynamicConfigStore.java
index 202f178..3923173 100644
--- a/apps/config/src/main/java/org/onosproject/config/impl/DistributedDynamicConfigStore.java
+++ b/apps/config/src/main/java/org/onosproject/config/impl/DistributedDynamicConfigStore.java
@@ -57,6 +57,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -108,6 +109,7 @@
                 .register(ListKey.class)
                 .register(KeyLeaf.class)
                 .register(BigInteger.class)
+                .register(BigDecimal.class)
                 .register(LinkedHashMap.class);
         keystore = storageService.<DataNode.Type>documentTreeBuilder()
                 .withSerializer(Serializer.using(kryoBuilder.build()))