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/hostsfile.go

@@ -27,6 +27,7 @@ type hostsFile struct {
 	watcher *fsnotify.Watcher
 	mu      sync.Mutex
 	m       map[string][]string
+	logger  *ctrld.Logger
 }
 
 // init performs initialization works, which is necessary before hostsFile can be fully operated.
@@ -55,7 +56,7 @@ func (hf *hostsFile) refresh() error {
 	// override hosts file with host_entries.conf content if present.
 	hem, err := parseHostEntriesConf(hostEntriesConfPath)
 	if err != nil && !os.IsNotExist(err) {
-		ctrld.ProxyLogger.Load().Debug().Err(err).Msg("could not read host_entries.conf file")
+		hf.logger.Debug().Err(err).Msg("could not read host_entries.conf file")
 	}
 	for k, v := range hem {
 		hf.m[k] = v
@@ -77,14 +78,14 @@ func (hf *hostsFile) watchChanges() {
 			}
 			if event.Has(fsnotify.Write) || event.Has(fsnotify.Rename) || event.Has(fsnotify.Chmod) || event.Has(fsnotify.Remove) {
 				if err := hf.refresh(); err != nil && !os.IsNotExist(err) {
-					ctrld.ProxyLogger.Load().Err(err).Msg("hosts file changed but failed to update client info")
+					hf.logger.Err(err).Msg("hosts file changed but failed to update client info")
 				}
 			}
 		case err, ok := <-hf.watcher.Errors:
 			if !ok {
 				return
 			}
-			ctrld.ProxyLogger.Load().Err(err).Msg("could not watch client info file")
+			hf.logger.Err(err).Msg("could not watch client info file")
 		}
 	}