Set build update log level to debug

We get this a lot.  It's not helpful.

Change-Id: Icf0191ded019c705a42446269d647cb52843ef58
Reviewed-on: https://review.openstack.org/36733
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
1 file changed