clear_trackexithosts_mappings() looks at the wrong source for its suffix
Right now, clear_trackexithosts_mappings(exitname) removes all mappings that came from TRACKEXIT where the original address of the mapping ends with .exitname.exit , when in fact it should remove entries whose remapped address ends with .exitname.exit.
This is called out with a new comment in my bug1090-part1 branch. It'll want to get fixed after #1090 (moved), which also touches that and some related code.