Keep the system locale in the openstack command.

By default puppet reset the locale to "C"[1].  This can cause problem
when openstack command have to deal with non ascii strings.

We use the override_locale parameter of the execute puppet method to
pass down the locale to the openstack command.

Co-Authored-By: Natal Ngétal <hobbestigrou@erakis.eu>
Closes-Bug: #1744075

[1] https://github.com/puppetlabs/puppet/blob/master/lib/puppet/util/execution.rb#L349-L357

Change-Id: Ia61308d54be4a72faf47b315989b63dc8f64aa09

lib/puppet/provider/openstack.rb

@@ -45,7 +45,7 @@ class Puppet::Provider::Openstack < Puppet::Provider
     begin
       action = args[1]
       Timeout.timeout(command_timeout(action)) do
-        openstack_command *args
+        execute([command(:openstack_command)] + args, override_locale: false)
       end
     rescue Timeout::Error
       raise Puppet::ExecutionFailure, "Command: 'openstack #{args.inspect}' has been running for more than #{command_timeout(action)} seconds"