/usr/sbin/shutdownconfig : Write xPSUBDIR variable

to /tmp/shutdownconfig_results, since case PUPMODE in 128 uses it,
and xPSUBDIR is only generated in shutdownconfig script, and not in
/etc/rc.d/rc.shurtdown anymore. PSAVEMARK uses this - never used
PSAVEMARK but I remember pics attached to the murga-forum showing
PSAVEMARK file.

Likely lots of space cleanup, too.