Stop referring to openstack/openstack-ci-puppet.

The openstack/openstack-ci-puppet repo moved and became
openstack-infra/config. Remove references to openstack-ci-puppet and
replace them with references to openstack-infra/config.

Change-Id: I75e7797995b894b6053901dbcfa351404048ea7c
Reviewed-on: https://review.openstack.org/23227
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins