Use bup to backup review-dev to an offsite server

* modules/openstack_project/manifests/review_dev.pp: Add the bup class
and bup site to backup review-dev to ci-backup-rs-ord.openstack.org.
This will backup the review-dev mysql dumps to an offsite location.

Change-Id: Iad6844e98e6832e23919e125d1c25af38088453e
Merge "Use bup to backup review-dev to an offsite server"