[remote] Don't close streaming layers ourselves (#768)

* [remote] Don't close streaming layers ourselves

"The request Body, if non-nil, will be closed by the underlying
Transport, even on errors."

https://golang.org/pkg/net/http/#Client.Do

Fixes #707

* Fix modules

Author: jonjohnsonjr

go.mod

@@ -261,8 +261,6 @@ func (w *writer) initiateUpload(from, mount string) (location string, mounted bo
 // On failure, this will return an error.  On success, this will return the location
 // header indicating how to commit the streamed blob.
 func (w *writer) streamBlob(blob io.ReadCloser, streamLocation string) (commitLocation string, err error) {
-	defer blob.Close()
-
 	req, err := http.NewRequest(http.MethodPatch, streamLocation, blob)
 	if err != nil {
 		return "", err

go.sum

@@ -250,7 +250,7 @@ golang.org/x/text/unicode/norm
 # golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1
 ## explicit
 golang.org/x/time/rate
-# golang.org/x/tools v0.0.0-20200910222312-571a207697e7
+# golang.org/x/tools v0.0.0-20200911153331-7ad463ce66dd
 ## explicit
 golang.org/x/tools/go/ast/astutil
 golang.org/x/tools/go/gcexportdata