[DAHLIN-4] Improve manual span assignment process

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The process for manually assigning spans in DAHDI is so convoluted, broken, and frustrating that it needs to be seriously overhauled and streamlined.

/etc/dahdi/assigned-spans.conf is basically cleared anytime dahdi_genconf is run or seemingly anything so much as a mouse sneezes. Getting DAHDI to obey static span ordering is very fickle and prone to not working.

Only needs to be done once: Add this to /etc/modprobe.d/dahdi: options dahdi auto_assign_spans=0

The only procedure that I have found to work consistently doesn't even make any sense:

• manually seed /etc/dahdi/assigned-spans.conf with the right order
• run dahdi_span_assignments remove
• run dahdi_span_assignments add
• run dahdi_span_assignments auto
• run dahdi_genconf (and then manually change PRIs to T1 CAS as needed)
• run dahdi_cfg -vvvvvv
• run rasterisk -x "module refresh chan_dahdi"

However, it doesn't even seem like this is correct, as dahdi_span_assignments auto undoes/ignores what "add" does, and indeed, the add command always seems to error out, i.e. is broken. After just running add (but not auto), dahdi_genconf will hang if run. This can make it impossible to order multiple spans correctly.

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