Fix all shellcheck warnings, mostly by adding double quotes around vars.
Re-order operations and run multiple jobs in parallel to speed up DPI
change speed.
Remove all use of bc, simple sh integer division is sufficient in all
cases.
Signed-off-by: Joe Groocock <me@frebib.net>
This is technically more of a restart than a reload, but it's the
closest thing without actually restarting the main pid.
Signed-off-by: Joe Groocock <me@frebib.net>