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: I1a0d7ca312ab7b54650a507f1dcfad27b66538ca

manifests/client.pp

@@ -20,4 +20,7 @@ class sahara::client (
     name   => $::sahara::params::client_package_name,
     tag    => 'openstack',
   }
+
+  include '::openstacklib::openstackclient'
+
 }

releasenotes/notes/add-openstackclient-client-aa1d52a23f5818cd.yaml

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

spec/classes/sahara_client_spec.rb

@@ -27,6 +27,7 @@ describe 'sahara::client' do
       }
     end
 
+    it { is_expected.to contain_class('openstacklib::openstackclient') }
   end
 
   on_supported_os({