update github URLs in documentation

Some puppet modules have been renamed in openstack-ci-puppet:

* `jenkins_slave` puppet module has been integrated in `jenkins` module
* `openstack-ci-config` has been renamed `openstack_project`

Change-Id: Ie4a35022301c156f74e1fdef859c87319efb60da
Reviewed-on: https://review.openstack.org/13519
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins
2 files changed