rafthttp: drop go1.4 tests

rafthttp/fake_roundtripper_go14_test.go

@@ -1,35 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build !go1.5
-
-package rafthttp
-
-import (
-	"errors"
-	"net/http"
-)
-
-func (t *roundTripperBlocker) RoundTrip(req *http.Request) (*http.Response, error) {
-	c := make(chan struct{}, 1)
-	t.mu.Lock()
-	t.cancel[req] = c
-	t.mu.Unlock()
-	select {
-	case <-t.unblockc:
-		return &http.Response{StatusCode: http.StatusNoContent, Body: &nopReadCloser{}}, nil
-	case <-c:
-		return nil, errors.New("request canceled")
-	}
-}

rafthttp/fake_roundtripper_test.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build go1.5
-
 package rafthttp
 
 import (