With this patch the unbound init routines manage resolv.conf if and only if
when unbound will listen on 127.0.0.1#53 and dnsmasq is not.
Also logs some cases where config values are overriden with sane defaults.
Fixes (partially) LEDE FS#785
Fixesopenwrt/packages#4487
Signed-off-by: Paul Oranje <por@xs4all.nl>