kill confusing code around pipeline ordering
kill confusing code around pipeline ordering

this seemed to set them all to (large number) + 1, and then set them all
to 0..N anyway.

Signed-off-by: Gabriel Dumitrescu <ac98dc248ba95b80e235d49d71a9a50afc4ea93d@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse