Merge remote-tracking branch 'origin/development/8.2' into HEAD

Rclone originally does not handle correctly the MD5 for MPU objects,
because their Etag is structure as "md5chksum-numparts".
Therefore a patch was made to not only transmit an x-amz-meta-md5chksum like
before but also to include an additional x-amz-meta-md5numparts.
This fix will check for this new header and reconstitute the MD5 correcly.
For non-MPU objects the behavior is unchanged and therefore backward
compatible.

lib/api/apiUtils/object/createAndStoreObject.js

@@ -200,15 +200,22 @@ function createAndStoreObject(bucketName, bucketMD, objectKey, objMD, authInfo,
                     const md5 = request.headers['x-amz-meta-md5chksum']
                         ? new Buffer(request.headers['x-amz-meta-md5chksum'],
                         'base64').toString('hex') : null;
+                    const numParts = request.headers['x-amz-meta-md5numparts'];
+                    let _md5;
+                    if (numParts === undefined) {
+                        _md5 = md5;
+                    } else {
+                        _md5 = `${md5}-${numParts}`;
+                    }
                     const versionId = request.headers['x-amz-meta-version-id'];
                     const dataGetInfo = {
                         key: objectKey,
                         dataStoreName: location,
                         dataStoreType: locationType,
                         dataStoreVersionId: versionId,
-                        dataStoreMD5: md5,
+                        dataStoreMD5: _md5,
                     };
-                    return next(null, dataGetInfo, md5);
+                    return next(null, dataGetInfo, _md5);
                 }
             }
             return dataStore(objectKeyContext, cipherBundle, request, size,