Reduce salt call timeout to 1s for fetch/checkout

On a timeout salt will continue running a job in the background.
Since we're using a returner we don't need to wait for the salt
master to return any data back to the peer. By timing out as soon
as possible we can reduce the salt overhead of a deploy by 29
seconds per stage.

Change-Id: Ie1e5f503f90cf0cb898dcad87693ac322dad2324