Falcon feed replication leaves behind old files when a feed instance is re-run

When we re-replicate the data from one cluster to another, replication copies and overwrites old files, but, does not remove extra files in destination (that are not in the source dir any more). Example, first replication run copied 14 part files, on rerun, the source only had 13 part files, the 14th file still lingers in the destination.