Bump up RRD4j dependency from 2.2 to 3.1

Change-Id: I4bfa18dce4779624205f85c214e0c8f8dcfd1c3a
diff --git a/lib/BUCK b/lib/BUCK
index 71f9651..6b7184a 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -1,4 +1,4 @@
-# ***** This file was auto-generated at Mon, 22 May 2017 16:14:48 GMT. Do not edit this file manually. *****
+# ***** This file was auto-generated at Mon, 22 May 2017 16:30:19 GMT. Do not edit this file manually. *****
 # ***** Use onos-lib-gen *****
 
 pass_thru_pom(
@@ -960,10 +960,10 @@
 
 remote_jar (
   name = 'rrd4j',
-  out = 'rrd4j-2.2.jar',
-  url = 'mvn:org.rrd4j:rrd4j:jar:2.2',
-  sha1 = 'e5aee992ece8c82291b77bef96cd1d11c1e0a009',
-  maven_coords = 'org.rrd4j:rrd4j:jar:NON-OSGI:2.2',
+  out = 'rrd4j-3.1.jar',
+  url = 'mvn:org.rrd4j:rrd4j:jar:3.1',
+  sha1 = 'e533553fbf52f241dcb0c468b2052a3814dd6722',
+  maven_coords = 'org.rrd4j:rrd4j:jar:NON-OSGI:3.1',
   visibility = [ 'PUBLIC' ],
 )