Fix source options hanging in Recreate Migration
Fix source options hanging in Recreate Migration

This is a regression bug cause by ad5e96adf15bbfb64010c489871f54609e915e51.

This commit improves on the method used to associate a request response
to its corresponding emitter. Initially proposed by commit ad5e96adf15bbfb64010c489871f54609e915e51.

aznashwan/coriolis-web,aznashwan/coriolis-web