Comment # 1 on bug 907702 from Stanislav Brabec

Confirming.

HALT_POWERDOWN_INSERT is now obsolete.

To be clean, the script attempts to remove its setup.

There are two values that were legal in some past versions:

Very old apcupsd versions:
/etc/apcupsd/apccontrol killpower

More recent apcupsd versions:
/etc/init\.d/apcupsd try-powerdown

The script should never see the old form, and the only one where action is
needed is the second one.

But if the HALT_POWERDOWN_INSERT is already empty, the script should not
complain. It is what we need.