Revert "Propagate statusPromise down to the actual change in throttler, see #2877"

This reverts commit 9c1a00d02017a1786820d27a62496afb7e8285ce.
Merge pull request #1005 from akka/wip-2877-revert-patriknw

Revert "Propagate statusPromise down to the actual change in throttler, ...