[PATCH]Enabling Auto poweron after power is restored.

[Manish Ahuja]

Resubmitting this patch with a sysfs interface instead of /proc.
During some off line discussion, /sys/power was suggested as a possible 
candidate area for this functionality to reside.

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During power outages, the ups notifies the system for a shutdown. In the 
current setup, it isn't possible to poweron when power is restored. This 
patch fixes the issue by calling the right ibm,power-off-ups token 
during such events. It also adds a sysfs interface so that rc.powerfail 
can parse the epow events and modify the power-off behavior accordingly 
to enable the right token to be called.

Signed-off-by: Manish Ahuja <ahuja at austin.ibm.com>

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