Removed MSCONCAT retry changes

Author: akharit

azure/datalake/store/core.py

@@ -548,8 +548,7 @@ def concat(self, outfile, filelist, delete_source=False):
         self.azure.call('MSCONCAT', outfile.as_posix(),
                         data=bytearray(json.dumps(sources,separators=(',', ':')), encoding="utf-8"),
                         deleteSourceDirectory=delete,
-                        headers={'Content-Type': "application/json"},
-                        retry_policy=ExponentialRetryPolicy(max_retries=0))
+                        headers={'Content-Type': "application/json"})
         self.invalidate_cache(outfile)
 
     merge = concat