Add nova keystone endpoint

This commit add the class nova::keystone::auth.

This class can be used to configure the keystone
endpoint and roles for nova.

keystone/auth.pp

@@ -0,0 +1,32 @@
+class nova::keystone::auth(
+  $auth_name = 'nova',
+  $password  = 'nova_password',
+  $service   = 'compute',
+  $address   = '127.0.0.1',
+  $port      = '8774',
+  $version   = 'v1.1'
+) {
+
+  Class['keystone::roles::admin'] -> Class['nova::keystone::auth']
+
+  keystone_user { $auth_name:
+    ensure   => present,
+    password => $password,
+  }
+  keystone_user_role { "${auth_name}@services":
+    roles   => 'admin',
+    require => Keystone_user[$auth_name]
+  }
+  keystone_service { $auth_name:
+    type        => 'image',
+    description => "Openstack Compute Service",
+  }
+  keystone_endpoint { $auth_name:
+    ensure       => present,
+    public_url   => "http://${address}:${port}/${version}/%(tenant_id)s",
+    admin_url    => "http://${address}:${port}/${version}/%(tenant_id)s",
+    internal_url => "http://${address}:${port}/${version}/%(tenant_id)s",
+    require      => Keystone_service[$auth_name],
+  }
+
+}