server/prpc: updated server according to protocol

server/prpc/auth.go

Index: server/prpc/auth.go
diff --git a/server/prpc/auth.go b/server/prpc/auth.go
index 62d7793333f4469e044e8693fc9ca70072c21f71..2931b6d3a0408d7884f3749063f154b69ca115b3 100644
--- a/server/prpc/auth.go
+++ b/server/prpc/auth.go
@@ -20,12 +20,12 @@ var defaultAuth = struct {
 // 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
 }