Use bup to backup review.o.o to an offsite server

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

Change-Id: I9ba10fd5bed8967c27bb958689ddfab76ec70e30
Merge "Use bup to backup review.o.o to an offsite server"