closes #2496 and #2552

Update Azure SDK with release v16.2.1
Update Azure autorest SDK with release v10.8.1

Signed-off-by: Yu Wang <yuwa@microsoft.com>

vendor/github.com/Azure/go-autorest/autorest/retriablerequest.go

@@ -0,0 +1,52 @@
+package autorest
+
+// Copyright 2017 Microsoft Corporation
+//
+//  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.
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net/http"
+)
+
+// NewRetriableRequest returns a wrapper around an HTTP request that support retry logic.
+func NewRetriableRequest(req *http.Request) *RetriableRequest {
+	return &RetriableRequest{req: req}
+}
+
+// Request returns the wrapped HTTP request.
+func (rr *RetriableRequest) Request() *http.Request {
+	return rr.req
+}
+
+func (rr *RetriableRequest) prepareFromByteReader() (err error) {
+	// fall back to making a copy (only do this once)
+	b := []byte{}
+	if rr.req.ContentLength > 0 {
+		b = make([]byte, rr.req.ContentLength)
+		_, err = io.ReadFull(rr.req.Body, b)
+		if err != nil {
+			return err
+		}
+	} else {
+		b, err = ioutil.ReadAll(rr.req.Body)
+		if err != nil {
+			return err
+		}
+	}
+	rr.br = bytes.NewReader(b)
+	rr.req.Body = ioutil.NopCloser(rr.br)
+	return err
+}