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_darwin.go

@@ -22,8 +22,8 @@ func dnsFns() []dnsFn {
 	return []dnsFn{dnsFromResolvConf, getDNSFromScutil, getAllDHCPNameservers}
 }
 
-func getDNSFromScutil() []string {
-	logger := *ProxyLogger.Load()
+func getDNSFromScutil(ctx context.Context) []string {
+	logger := LoggerFromCtx(ctx)
 
 	const (
 		maxRetries    = 10
@@ -109,8 +109,8 @@ func getDHCPNameservers(iface string) ([]string, error) {
 	return nameservers, nil
 }
 
-func getAllDHCPNameservers() []string {
-	logger := *ProxyLogger.Load()
+func getAllDHCPNameservers(ctx context.Context) []string {
+	logger := LoggerFromCtx(ctx)
 
 	interfaces, err := net.Interfaces()
 	if err != nil {