server/prpc: updated server according to protocol

server/prpc/auth.go

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package prpc
 
 import (
         "sync"
 
         "github.com/luci/luci-go/server/auth"
 )
 
 var defaultAuth = struct {
         sync.RWMutex
         Authenticator auth.Authenticator
 }{}
 
 // RegisterDefaultAuth sets a default authenticator that is used unless
 // Server.CustomAuthenticator is true.
 // Panics if a is nil or called twice.
 func RegisterDefaultAuth(a auth.Authenticator) {
         if a == nil {
-                panicf("a is nil")
+                panic("a is nil")
         }
         defaultAuth.Lock()
         defer defaultAuth.Unlock()
         if defaultAuth.Authenticator != nil {
-                panicf("default prpc authenticator is already set")
+                panic("default prpc authenticator is already set")
         }
         defaultAuth.Authenticator = a
 }
 
 // GetDefaultAuth returns the default authenticator set by RegisterDefaultAuth
 // or nil if not registered.
 func GetDefaultAuth() auth.Authenticator {
         defaultAuth.RLock()
         defer defaultAuth.RUnlock()
         return defaultAuth.Authenticator
 }