Initialize LogConfig in daemon mode

Signed-off-by: Marius Sturm <marius@graylog.com>
(cherry picked from commit e904cbec03654765d65a29d6709d84ee43c7bde8)

Conflicts:
	docker/daemon.go

docker/daemon.go

@@ -76,6 +76,7 @@ func NewDaemonCli() *DaemonCli {
 
 	// TODO(tiborvass): remove InstallFlags?
 	daemonConfig := new(daemon.Config)
+	daemonConfig.LogConfig.Config = make(map[string]string)
 	daemonConfig.InstallFlags(daemonFlags, presentInHelp)
 	daemonConfig.InstallFlags(flag.CommandLine, absentFromHelp)
 	registryOptions := new(registry.Options)
@@ -208,10 +209,6 @@ func (cli *DaemonCli) CmdDaemon(args ...string) error {
 		}()
 	}
 
-	if cli.LogConfig.Config == nil {
-		cli.LogConfig.Config = make(map[string]string)
-	}
-
 	serverConfig := &apiserver.ServerConfig{
 		Logging:     true,
 		EnableCors:  cli.EnableCors,