Keep reviewday repo up to date on filesystem

Changes to vcsrepo stanza in reviewday puppet module to keep the
reviewday checkout up to date with changes to master.

Change-Id: I0cbe2c06622545948c9b645c45eac19887b4c440
Reviewed-on: https://review.openstack.org/25555
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins