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.

internal/clientinfo/ptr_lookup.go

@@ -17,6 +17,7 @@ type ptrDiscover struct {
 	hostname   sync.Map // ip => hostname
 	resolver   ctrld.Resolver
 	serverDown atomic.Bool
+	logger     *ctrld.Logger
 }
 
 func (p *ptrDiscover) refresh() error {
@@ -73,14 +74,14 @@ func (p *ptrDiscover) lookupHostname(ip string) string {
 	msg := new(dns.Msg)
 	addr, err := dns.ReverseAddr(ip)
 	if err != nil {
-		ctrld.ProxyLogger.Load().Info().Str("discovery", "ptr").Err(err).Msg("invalid ip address")
+		p.logger.Info().Str("discovery", "ptr").Err(err).Msg("invalid ip address")
 		return ""
 	}
 	msg.SetQuestion(addr, dns.TypePTR)
 	ans, err := p.resolver.Resolve(ctx, msg)
 	if err != nil {
 		if p.serverDown.CompareAndSwap(false, true) {
-			ctrld.ProxyLogger.Load().Info().Str("discovery", "ptr").Err(err).Msg("could not perform PTR lookup")
+			p.logger.Info().Str("discovery", "ptr").Err(err).Msg("could not perform PTR lookup")
 			go p.checkServer()
 		}
 		return ""