Use --use-public instead of --dev for run_project_tests.sh
Use --use-public instead of --dev for run_project_tests.sh

run_project_tests.sh is meant to be used when building commits from
review.openstack.org. In those cases, there are no changes to the
distgit from the current repo, so there is no need to use --dev.

By not using --dev, we can make the CI jobs forward-compatible with
the new DLRN+nodepool architecture, since the dlrn-remote patch
(https://review.rdoproject.org/r/2498) requires having all commit
metadata. With this, we can reuse the DLRN-rpmbuild job for the package
build part.

Change-Id: I5832912b9b60a17ca34ee90215575d6c9fe98e25

openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/delorean,openstack-packages/DLRN