Using sadis:3.1.0 version

Change-Id: Iaba94ccbbd2821c091fd7cf55c80c31a45939e04
diff --git a/api/pom.xml b/api/pom.xml
index e9a9fe1..8a1264e 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -31,7 +31,7 @@
     <description>DHCP L2 Relay application API</description>
 
     <properties>
-        <sadis.api.version>3.0.0</sadis.api.version>
+        <sadis.api.version>3.1.0</sadis.api.version>
     </properties>
 
     <dependencies>