Fix ssh public key on jenkins-dev.

The "openstack_project" module must be included in order to reference
the ssh public key variable.

Change-Id: I7126bff62134d220d8e90e457788100eee04e04b
Reviewed-on: https://review.openstack.org/31550
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Elizabeth Krumbach Joseph <lyz@princessleia.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins