Merge pull request #38 from vintmd/mpu-exception

double check of the complete mpu success return immediately

src/main/java/org/apache/hadoop/fs/CosNativeFileSystemStore.java

@@ -1271,6 +1271,7 @@ private <X> Object callCOSClientWithRetry(X request) throws CosServiceException,
                     }
                     LOG.warn("Complete mpu resp not complete key [{}]", key);
                     // todo: some other double check after cgi unified the ctime of mpu.
+                    return new CompleteMultipartUploadResult();
                 } else {
                     throw new IOException(nce);
                 }