Improve DNS diagnostics

This set of changes should make debugging kresd easier. The part with verbose logging is a bit hacky but we need to get things moving quickly to enable diagnosing problems with Google services.

diagnostics/modules/dns.module

@@ -9,6 +9,9 @@ run () {
 	uci -q show resolver
 	echo
 
+	echo "== resolv.conf* =="
+	grep -H '' /etc/resolv.conf* /tmp/resolv.conf*
+
 	echo "== DNSSEC root key file =="
 	ROOTKEYFILE=$(uci get resolver.common.keyfile)
 	ls -al "${ROOTKEYFILE}"
@@ -16,8 +19,6 @@ run () {
 	grep -H '' "${ROOTKEYFILE}"
 	echo
 
-	grep -H '' /etc/resolv.conf*
-
 	# try to resolve some server
 	nslookup api.turris.cz 127.0.0.1  # should pass
 	nslookup www.rhybar.cz 127.0.0.1  # should fail