Add stackforge/puppet-tempest to git/lp mapping

Change-Id: I79a300be354f57d02919121488cf9d5f6add1d2c
Reviewed-on: https://review.openstack.org/30197
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins