Create /etc/resolv.conf as a relative symlink

This matches with /usr/lib/tmpfiles.d/systemd-resolve.conf.

Please rebase :)

added 5 commits

• d1bb4ed9...83c58570 - 4 commits from branch archlinux:master
• ff22bfc4 - Create /etc/resolv.conf as a relative symlink

Compare with previous version

mentioned in commit 44e69021

merged