Currently we only have 40 testenvironments and with the sustained
backlog of reviews this can lead to cascade failure (normally the
slight excess gains efficiency by allowing
building/deleting/copying-logs jobs to be doing that while 40 or so
active jobs use testenvs. We'll re-up it once the overload is gone.
Change-Id: Id7332c1d341aa48deae49576839d12b6fdf36b68