Add parameters for mavencentral auth

The manifests/site.pp file was attempting to pass parameters to
the pypi_slave class which the pypi_slave class was unable to receive.

Change-Id: Ib84e9f6b7a3f0f20af7e19c7c1a3cd38b68b0a77

modules/openstack_project/manifests/pypi_slave.pp

@@ -20,7 +20,9 @@ class openstack_project::pypi_slave (
   $jenkins_ssh_public_key,
   $pypi_username = 'openstackci',
   $jenkinsci_username,
-  $jenkinsci_password
+  $jenkinsci_password,
+  $mavencentral_username,
+  $mavencentral_password
 ) {
   class { 'openstack_project::slave':
     ssh_key => $jenkins_ssh_public_key,