* On some systems/configurations, dahdi init script may kick in
during the time that hotplug scripts are configuring spans.
* It may lead to a race since the init script runs "dahdi_auto_assign_compat"
which calls "dahdi_registration" and that tries to run
"dahdi_span_assignments auto ..."
* Use the newly-added "dahdi_span_assignments" "unmatched" operation.
* Now the "dahdi_auto_assign_compat" script only runs "dahdi_registration"
if there are no "unmatched" Astribanks.
* This prevents the race in fully configured systems.
The race may still exist on partially-configured systems.
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