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: I6e99e240e75fd4cfa9ec94b0587e46668e1b259e

manifests/client.pp

@@ -21,4 +21,6 @@ class zaqar::client (
     tag    => 'openstack',
   }
 
+  include '::openstacklib::openstackclient'
+
 }

releasenotes/notes/add-openstackclient-client-afece91a0456fec0.yaml

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

spec/classes/zaqar_client_spec.rb

@@ -14,6 +14,8 @@ describe 'zaqar::client' do
         :tag    => 'openstack',
       )
     end
+
+    it { is_expected.to contain_class('openstacklib::openstackclient') }
   end
 
   on_supported_os({