#196 Allow easy use of /etc/resolv.onf when compiled with unbound

[Joerg Dorchain]

I am using the debian package of opendkim on a machine on a private network with no direct internet access. DNS resolution is fine, but only via the nameserver defined is /etc/resolv.conf. These change once in while.
The debian package is compiled --with-unbound.

For me, it would be great to add on option that allows use of /etc/resolv.conf with unbound. The nameservers option exists, but I'd like to use exactly the same nameservers with opendkim as the system default resolvers. This would directly translate into a call of ub_ctx_resolvconf at about the same position as ub_ctx_set_fwd is called for the nameservers option. A name for this option could be Resolvconf.

Thank you for considering.