fixing multilogger so that v is properly nil instead of an empty slice if not specified

logging/funcs_std.go

@@ -9,7 +9,7 @@ import (
 func (l *StdLogger) Setup() {
 
 	l.Logger = log.Default()
-	l.Logger.SetPrefix(l.Prefix)
+	l.Logger.SetPrefix(l.Prefix + " ")
 }
 
 // Shutdown cleanly shuts down a StdLogger.
@@ -38,8 +38,8 @@ func (l *StdLogger) DoDebug(d bool) {
 
 // SetPrefix sets the prefix for this StdLogger.
 func (l *StdLogger) SetPrefix(prefix string) {
-	l.Prefix = prefix
-	l.Logger.SetPrefix(prefix)
+	l.Prefix = prefix + " "
+	l.Logger.SetPrefix(prefix + " ")
 }
 
 // Alert writes an ALERT-level message to this StdLogger.