pdnsd: run as pdnsd user, not root

This also renames /etc/pdnsd.conf.sample to /etc/pdnsd.conf in order to
generate pacnew files. Otherwise, upgrades like this would cause silent
breakage.


git-svn-id: file:///srv/repos/svn-community/svn@108219 9fca08f4-af9d-4005-b8df-a31f2cc04f65
archrelease: copy trunk to community-i686, community-x86_64

git-svn-id: file:///srv/repos/svn-community/svn@108220 9fca08f4-af9d-4005-b8df-a31f2cc04f65