Revert "queue based merge_files"
Revert "queue based merge_files"

This reverts commit 79e4218460e908ef4ae4c5e9b25bc1110b528b76.

mmd-osm/Overpass-API,mmd-osm/Overpass-API,mmd-osm/Overpass-API,mmd-osm/Overpass-API