Switch to metadata.json for Puppet forge releases

Since puppet 3.x, Puppet Labs Forge accept only the metadata.json
for module description (Modulefile is now deprecated).

This patch :
 - convert the Modulefile to metadata.json.
 - bump major version to 5 (for juno).
 - switch to stackforge namespace.
 - relax pe version_requirement to 3.x.

Change-Id: I9c83b577887210486fa03ed358910e129069a57c

Modulefile

@@ -1,8 +0,0 @@
-name    'puppetlabs-openstack_extras'
-version '5.0.0-devel'
-source  'https://github.com/stackforge/puppet-openstack_extras'
-author  'StackForge Contributors'
-license 'Apache License 2.0'
-summary 'Puppet OpenStack Extras Module'
-description 'Puppet module to add useful utilities for OpenStack deployments'
-project_page 'https://launchpad.net/puppet-openstack_extras'

metadata.json

@@ -0,0 +1,35 @@
+{
+  "name": "stackforge-openstack_extras",
+  "version": "5.0.0",
+  "author": "StackForge Contributors",
+  "summary": "Puppet OpenStack Extras Module",
+  "license": "Apache License 2.0",
+  "source": "git://github.com/stackforge/puppet-openstack_extras.git",
+  "project_page": "https://launchpad.net/puppet-openstack_extras",
+  "issues_url": "https://bugs.launchpad.net/puppet-openstack_extras",
+  "requirements": [
+    { "name": "pe","version_requirement": "3.x" },
+    { "name": "puppet","version_requirement": "3.x" }
+  ],
+  "operatingsystem_support": [
+    {
+      "operatingsystem": "Debian",
+      "operatingsystemrelease": ["7"]
+    },
+    {
+      "operatingsystem": "Fedora",
+      "operatingsystemrelease": ["20"]
+    },
+    {
+      "operatingsystem": "RedHat",
+      "operatingsystemrelease": ["6.5","7"]
+    },
+    {
+      "operatingsystem": "Ubuntu",
+      "operatingsystemrelease": ["12.04","14.04"]
+    }
+  ],
+  "description": "Puppet module to add useful utilities for OpenStack deployments",
+  "dependencies": [
+  ]
+}