all: eliminate usage of global ProxyLogger

So setting up logging for ctrld binary and ctrld packages could be done
more easily, decouple the required setup for interactive vs daemon
running.

This is the first step toward replacing rs/zerolog libary with a
different logging library.

nameservers_unix.go

@@ -3,6 +3,7 @@
 package ctrld
 
 import (
+	"context"
 	"net"
 	"slices"
 	"time"
@@ -20,7 +21,7 @@ func currentNameserversFromResolvconf() []string {
 // dnsFromResolvConf reads usable nameservers from /etc/resolv.conf file.
 // A nameserver is usable if it's not one of current machine's IP addresses
 // and loopback IP addresses.
-func dnsFromResolvConf() []string {
+func dnsFromResolvConf(_ context.Context) []string {
 	const (
 		maxRetries    = 10
 		retryInterval = 100 * time.Millisecond