Revert "raft: fix logger Panic variadic parameter"

This reverts commit 5a94aba33eeb504e7036a27268c67f6a1796445e.

raft/logger.go

@@ -114,7 +114,7 @@ func (l *DefaultLogger) Fatalf(format string, v ...interface{}) {
 }
 
 func (l *DefaultLogger) Panic(v ...interface{}) {
-	l.Logger.Panic(v..)
+	l.Logger.Panic(v)
 }
 
 func (l *DefaultLogger) Panicf(format string, v ...interface{}) {