Manifest PUT should return 202 Accepted status

Signed-off-by: Stephen J Day <stephen.day@docker.com>

docs/api_test.go

@@ -336,8 +336,7 @@ func TestManifestAPI(t *testing.T) {
 	}
 
 	resp = putManifest(t, "putting signed manifest", manifestURL, signedManifest)
-
-	checkResponse(t, "putting signed manifest", resp, http.StatusOK)
+	checkResponse(t, "putting signed manifest", resp, http.StatusAccepted)
 
 	resp, err = http.Get(manifestURL)
 	if err != nil {

docs/images.go

@@ -92,6 +92,8 @@ func (imh *imageManifestHandler) PutImageManifest(w http.ResponseWriter, r *http
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
+
+	w.WriteHeader(http.StatusAccepted)
 }
 
 // DeleteImageManifest removes the image with the given tag from the registry.