Install its-storyboard plugin on review.o.o

Install Gerrit its-storyboard plugin[1] to support integration between
gerrit and storyboard. Install the plugin from tarballs.o.o[2] to
review.o.o.

Additional requirement for this change to take effect:
1. A parameter needs to be set to enable its-storyboard plugin.  This
   is a per project setting in refs/meta/config (project.config file)
   If we want to enable for all project then set this param in
   All-Projects:
    [plugin "its-storyboard"]
      enabled = true

[1] https://gerrit.googlesource.com/plugins/its-storyboard
[2] http://tarballs.openstack.org/ci/gerrit/plugins/its-storyboard

Change-Id: Iae0762f86c1d90902f9ad77ce47e967008a46885

modules/openstack_project/manifests/review.pp

@@ -301,9 +301,8 @@ class openstack_project::review (
     require                             => $::project_config::config_dir,
   }
 
-  gerrit::plugin { 'javamelody':
-    version => '3fefa35',
-  }
+  gerrit::plugin { 'javamelody': version       => '3fefa35' }
+  gerrit::plugin { 'its-storyboard': version   => 'a9cb131' }
 
   class { 'gerritbot':
     nick                    => 'openstackgerrit',