kill processes using the filesystem before unmounting (#34)
kill processes using the filesystem before unmounting (#34)

seems to work best via lsof  (also tried fuser, which did not
work at all, and pkill -P $$, which caused suicide of the trap
SIGEXIT handler)

also adjusted sleep timing so that we don't get killed by
the amazon 60 second watchdog before we delete the volumes
kislyuk/aegea,kislyuk/aegea,kislyuk/aegea