Pass $mysql_password through, part two

* modules/openstack_project/manifests/review_dev.pp: Following on
771aded, apply a similar change to this file so review-dev.o.o can
apply its Puppet configuration successfully again.

Change-Id: Ie7c0c3efd9066cae4a09f30a90ab950d2b7bdb93
Merge "Pass $mysql_password through, part two"