Revert "Concurrency concerns :| Still slow."

This reverts commit 37bcdc6500206ee13196a5632d3354001bdb1bab.
Compiles.
Remove StartedFlow from messages to send, if the flow has already completed.
Explicitly unregister coflows instead of timing out, which was causing some issues.
Bug fix.
Bug fix: Stop losing messages between connecting to the local slave.