HZDistributedAtomicLong measurement code

- Part of ONOS-1767

Change-Id: I635ddde1863dffb8d68fa83e22bb7dde7c44136e
diff --git a/pom.xml b/pom.xml
index 9ccd5d9..a0bca46 100644
--- a/pom.xml
+++ b/pom.xml
@@ -761,6 +761,12 @@
       <version>${powermock.version}</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-math3</artifactId>
+      <version>3.3</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
   <profiles>
     <!-- Jenkins by default defines a property BUILD_NUMBER which is used to