fix CDE / XDM after upgrades

fix XDM (XDMCP query)

to fix change the DESKTOP variable to CDE otherwise dtlogin will not start
ch_rc -l -p DESKTOP
ch_rc -a -p DESKTOP=CDE

Also to get the dtlogin process to listen for incoming XDM connections
you need to comment out the Dtlogin.requestPort line (see the comments
in the Xconfig file)

vi /etc/dt/config/Xconfig
#Dtlogin.requestPort: 0

then start it:
/sbin/init.d/dtlogin.rc start