apcupsd: Make apcupsd working out of the box

This update fixes the installation of apcupsd sysconfig file. It also will not attempt to use not existing powersave-notify script.
- bnc#856907: Do not call powersave-notify
- bnc#837337: Add %fillup prereq tag and %{fillup_only} in the %post-section of the spec-file to correctly fillup sysconfig file

Fixed bugs
bnc#837337
installation of apcupsd does not create /etc/sysconfig/apcupsd
bnc#856907
apcupsd wants to execute /usr/lib/powersave/powersave-notify which is missing
Selected Binaries
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