start task delegate before running container process
start task delegate before running container process

This caused an issue where build events were out of order/interleaved

Signed-off-by: Clara Fu <d5c8bdbc15689555c92563892e959c79b3fc425f@pivotal.io>

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