A new run metadata key, build_newrev, started showing up in the db recently. [1] It's not actually something we want to expose, since it is unique for each job and not something we can group on. This commit adds it to the list of ignored keys so we don't have to see it anymore. [1] http://status.openstack.org/openstack-health/#/?groupKey=build_newrev Change-Id: Iea4a0babe10cd8d54a31e39dc5c3738570fda126