Prune dependencies (#1917)

When running `dep prune` explicitly, the following message show up:
```
dep prune
Pruning is now performed automatically by dep ensure.
```

However, after the explicit `dep prune`, there are still many files deleted. (Guess `dep ensure` is not complete yet).

This fix did a `dep prune` to clean up unneeded files.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

vendor/k8s.io/client-go/rest/fake/BUILD

@@ -1,32 +0,0 @@
-package(default_visibility = ["//visibility:public"])
-
-load(
-    "@io_bazel_rules_go//go:def.bzl",
-    "go_library",
-)
-
-go_library(
-    name = "go_default_library",
-    srcs = ["fake.go"],
-    importpath = "k8s.io/client-go/rest/fake",
-    deps = [
-        "//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/types:go_default_library",
-        "//vendor/k8s.io/client-go/rest:go_default_library",
-        "//vendor/k8s.io/client-go/util/flowcontrol:go_default_library",
-    ],
-)
-
-filegroup(
-    name = "package-srcs",
-    srcs = glob(["**"]),
-    tags = ["automanaged"],
-    visibility = ["//visibility:private"],
-)
-
-filegroup(
-    name = "all-srcs",
-    srcs = [":package-srcs"],
-    tags = ["automanaged"],
-)

vendor/k8s.io/client-go/rest/fake/fake.go

@@ -1,122 +0,0 @@
-/*
-Copyright 2014 The Kubernetes Authors.
-
-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.
-*/
-
-// This is made a separate package and should only be imported by tests, because
-// it imports testapi
-package fake
-
-import (
-	"net/http"
-	"net/url"
-
-	"k8s.io/apimachinery/pkg/runtime"
-	"k8s.io/apimachinery/pkg/runtime/schema"
-	"k8s.io/apimachinery/pkg/types"
-	restclient "k8s.io/client-go/rest"
-	"k8s.io/client-go/util/flowcontrol"
-)
-
-func CreateHTTPClient(roundTripper func(*http.Request) (*http.Response, error)) *http.Client {
-	return &http.Client{
-		Transport: roundTripperFunc(roundTripper),
-	}
-}
-
-type roundTripperFunc func(*http.Request) (*http.Response, error)
-
-func (f roundTripperFunc) RoundTrip(req *http.Request) (*http.Response, error) {
-	return f(req)
-}
-
-// RESTClient provides a fake RESTClient interface.
-type RESTClient struct {
-	Client               *http.Client
-	NegotiatedSerializer runtime.NegotiatedSerializer
-	GroupVersion         schema.GroupVersion
-	VersionedAPIPath     string
-
-	Req  *http.Request
-	Resp *http.Response
-	Err  error
-}
-
-func (c *RESTClient) Get() *restclient.Request {
-	return c.request("GET")
-}
-
-func (c *RESTClient) Put() *restclient.Request {
-	return c.request("PUT")
-}
-
-func (c *RESTClient) Patch(pt types.PatchType) *restclient.Request {
-	return c.request("PATCH").SetHeader("Content-Type", string(pt))
-}
-
-func (c *RESTClient) Post() *restclient.Request {
-	return c.request("POST")
-}
-
-func (c *RESTClient) Delete() *restclient.Request {
-	return c.request("DELETE")
-}
-
-func (c *RESTClient) Verb(verb string) *restclient.Request {
-	return c.request(verb)
-}
-
-func (c *RESTClient) APIVersion() schema.GroupVersion {
-	return c.GroupVersion
-}
-
-func (c *RESTClient) GetRateLimiter() flowcontrol.RateLimiter {
-	return nil
-}
-
-func (c *RESTClient) request(verb string) *restclient.Request {
-	config := restclient.ContentConfig{
-		ContentType:          runtime.ContentTypeJSON,
-		GroupVersion:         &c.GroupVersion,
-		NegotiatedSerializer: c.NegotiatedSerializer,
-	}
-
-	ns := c.NegotiatedSerializer
-	info, _ := runtime.SerializerInfoForMediaType(ns.SupportedMediaTypes(), runtime.ContentTypeJSON)
-	internalVersion := schema.GroupVersion{
-		Group:   c.GroupVersion.Group,
-		Version: runtime.APIVersionInternal,
-	}
-	serializers := restclient.Serializers{
-		// TODO this was hardcoded before, but it doesn't look right
-		Encoder: ns.EncoderForVersion(info.Serializer, c.GroupVersion),
-		Decoder: ns.DecoderToVersion(info.Serializer, internalVersion),
-	}
-	if info.StreamSerializer != nil {
-		serializers.StreamingSerializer = info.StreamSerializer.Serializer
-		serializers.Framer = info.StreamSerializer.Framer
-	}
-	return restclient.NewRequest(c, verb, &url.URL{Host: "localhost"}, c.VersionedAPIPath, config, serializers, nil, nil, 0)
-}
-
-func (c *RESTClient) Do(req *http.Request) (*http.Response, error) {
-	if c.Err != nil {
-		return nil, c.Err
-	}
-	c.Req = req
-	if c.Client != nil {
-		return c.Client.Do(req)
-	}
-	return c.Resp, nil
-}