privoxy: Fixed unsuccessful start with systemd

This update fixes the following issue with privoxy:
- Fixed unsuccessful start of privoxy with systemd:
- bnc#849923: Privoxy isn't chrooted properly, added option --chroot to privoxy.service
- bnc#852941: Added ExecStartPre commands to privoxy.service to fix DNS resolution due to missing population of chroot env

Fixed bugs
bnc#849923
privoxy fails to start in openSUSE 13.1
bnc#852941
privoxy: no DNS resolution due to missing population of chroot env.
Selected Binaries
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