Consider additional batteries for power management (when the critical battery timer is running)

After resuming from suspend, all batteries are added
to powerdevil. When a battery, with charge lower or
equal than the critical charge percentage is added, the
critical battery timer will be started.

In the current version the critical battery timeout can
only be interrupted by plugging in AC.

But if the system has more than one battery, the global
charge percentage can be greater than the critical charge
percentage and so the system shouldn't suspend. To achive
this behaviour, we calculate the global charge percentage
whenever a new battery was added and if the critical
battery timer is running and the global charge is high
enough, we stop the timer.

Also we use the already calculated global charge percentage
for the battery charge percentage notification instead of
the charge of each individual battery.

With this patch, the user can not only interrupt the critical
timer by plugging in the AC but also by plugging in a new or
additional battery (if the battery has enough charge).

Note: The 30 sec timeout message will still popup.

Tested with a Thinkpad T440s (two batteries)

@Philipp Paris: Thanks for testing!



FIXED-IN: 4.11.11
REVIEW: 118801