collectd: fix script by adding apache script exec domain

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
collectd: misc fixes

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
dbus: interact with systemd logind files

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
policykit: allow to read systemd login files

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>