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: I1f571d7fac536e95c1acc0ddd9d463672dc25a37

manifests/client.pp

@@ -43,4 +43,6 @@ class trove::client (
     tag    => 'openstack',
   }
 
+  include '::openstacklib::openstackclient'
+
 }

releasenotes/notes/add-openstackclient-client-aa12e000df7722b3.yaml

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

spec/classes/trove_client_spec.rb

@@ -41,6 +41,7 @@ describe 'trove::client' do
       )}
     end
 
+    it { is_expected.to contain_class('openstacklib::openstackclient') }
   end
 
   on_supported_os({