Update pip provider to use openstack_pip provider

Change-Id: I9fcfe12a2aecb99be0dd36e6a5a57e45f56533ca
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

manifests/init.pp

@@ -12,7 +12,7 @@ class github(
   if ! defined(Package['PyGithub']) {
     package { 'PyGithub':
       ensure   => latest,  # okay to use latest for pip
-      provider => pip,
+      provider => openstack_pip,
       require  => Class['pip'],
     }
   }