changed aws sleep retry logic to interval cap at 32 seconds instead of 4 minutes

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
formatting

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
increase number of retries for aws since sleep interval was capped at 32 seconds

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
backfill test for ResourceWait#for_resource sleep callback

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>