Prepare 3.1.0 release (liberty)

Update metadata.json, release-note and README for 3.1.0 release.

Change-Id: I1d451903a075826e2beea9e5d7fe9e5ffaaf9781

CHANGELOG.md

@@ -1,3 +1,16 @@
+##2016-05-20 - 3.1.0
+
+###Summary
+
+This is a bugfix release in the Liberty series.
+
+####Bugfixes
+
+- Add missing dev keyword to ip link command
+- Fix vs_port usage in Red Hat distros
+- Remove duplicate loading of constants
+
+
 ##2015-11-25 - 3.0.0
 ###Summary
 

README.md

@@ -1,7 +1,7 @@
 VSwitch
 =======
 
-3.0.0 - 2015.2 - Liberty
+3.1.0 - 2015.2 - Liberty
 
 A Puppet module providing things for vSwitches. At the moment OVS is the only
 one I've added but please feel free to contribute new providers through

metadata.json

@@ -1,6 +1,6 @@
 {
   "name": "openstack-vswitch",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "author": "Endre Karlson, Dan Bode and OpenStack Contributors",
   "license": "Apache-2.0",
   "source": "git://github.com/openstack/puppet-vswitch.git",