Define sub-types of Bandwidth to reduce round-off error

Two sub-types are defined
- LongBandwidth
- DoubleBandwidth
LongBandwidth can reduce round-off error cause by floating point arithmetics.
These classes are not exposed outside the package and only instantiated
through static factory methods.

Change-Id: Ice5d8ff1397c9dd9c8c1fff46af256fff08fa616
diff --git a/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java b/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
index aca0acc..9ee9cd9 100644
--- a/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
+++ b/core/store/serializers/src/test/java/org/onosproject/store/serializers/KryoSerializerTest.java
@@ -397,6 +397,7 @@
 
     @Test
     public void testBandwidth() {
+        testSerializedEquals(Bandwidth.mbps(1000));
         testSerializedEquals(Bandwidth.mbps(1000.0));
     }