Revert "Use /etc/resolv.conf file rather than resolvconf symlink for testenv"

This reverts commit f7ea3c457bcff940ef0e093ea8d62de436e8fa33.
Better solution for resolvconf/dnsmasq interaction
Remove dnsmasq resolvconf config
Merge pull request #251 from blueboxgroup/dnsmasq-resolvconf

Dnsmasq resolvconf