Removing deprecated pyarrow.hdfs.connect call from iorw.py (#615)

* SInce v2.0: pyarrow.hdfs.connect is deprecated, calling pyarrow.fs.HadoopFileSystem instead.

Addressing commonly see warning in iorw.py file.

/usr/local/lib/python3.7/dist-packages/papermill/iorw.py:50: FutureWarning: pyarrow.HadoopFileSystem is deprecated as of 2.0.0, please use pyarrow.fs.HadoopFileSystem instead.
  from pyarrow import HadoopFileSystem

* Update papermill/iorw.py

Co-authored-by: Matthew Seal <mseal007@gmail.com>

papermill/iorw.py

@@ -47,7 +47,11 @@
 except ImportError:
     GCSFileSystem = missing_dependency_generator("gcsfs", "gcs")
 try:
-    from pyarrow import HadoopFileSystem
+    try:
+      from pyarrow.fs import HadoopFileSystem
+    except ImportError:
+      # Attempt the older package import pattern in case we're using an old dep version.
+      from pyarrow import HadoopFileSystem
 except ImportError:
     HadoopFileSystem = missing_dependency_generator("pyarrow", "hdfs")