Add openstackclient installation to the client class

The repo is inside the openstackclient plugin commands[1].

[1]https://docs.openstack.org/python-openstackclient/latest/cli/plugin-commands.html

Change-Id: Ifa350a8056df0b5ff75d7755df4f05ed2a187272

manifests/client.pp

@@ -19,4 +19,6 @@ class congress::client (
     tag    => 'openstack',
   }
 
+  include '::openstacklib::openstackclient'
+
 }

releasenotes/notes/add-openstackclient-client-9e49434320313093.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Add openstackclient installation to the client class.

spec/classes/congress_client_spec.rb

@@ -16,6 +16,7 @@ describe 'congress::client' do
           :tag    => 'openstack',
         )
       end
+      it { is_expected.to contain_class('openstacklib::openstackclient') }
     end
 
   end