We run these ansible jobs serially which means we don't gain much by
forcing ansible to use a small number of forks. Double the default for
our infra prod job fork count from 5 to 10 to see if this speeds up our
deploy jobs.
Note some jobs override this value to either add more forks or fewer
when necessary. These are left as is.
Change-Id: I6fded724cb9c8654153bcc5937eae7203326076e
8d9975be67