Bash script to be used after the main 2.3-2.4 db upgrade

This script, originally offered by Thomas Berezansky and tested by others,
and augmented by me to include more parallizable SQL, will reduce the
time spent upgrading a large Evergreen 2.3 database to 2.4 by several hours.

Signed-off-by: Mike Rylander <mrylander@gmail.com>