Allow battery level config file to define also wakeup parameter

By default FULL and NORMAL do not use wakeup flag, but LOW, WARNING
and EMPTY will.

This can be changed by adding third parameter to appropriate line
in the battery levels configuration file.

[dsme] Allow battery level config file to define also wakeup parameter
Change battery empty shutdown limit to 3%

The 5% is too high for a default value.

[dsme] Change battery empty shutdown limit to 3%