sapling: remove unused Python imports

Summary: Remove unused imports across several sapling/ Python files, identified by the RemoveUnusedImportsWithGlean codemod. Removed imports: `os` and `defaultdict` from subtree.py, `hashlib` and `sys` from context.py, `sys` from encoding.py and httpclient/__init__.py, `error`/`getdefaultmaxuntrackedsize`/`parsemaxuntracked`/`parsemaxuntrackedbytes`/`fetchsnapshot` from snapshot/latest.py, `errno` and `stat` from pathutil.py, and `getpass` from posix.py.

Reviewed By: VladimirMakaev

Differential Revision: D101266570

fbshipit-source-id: 6299c492ea99f6e2d1b6717f814e72e27a2830e7

Author: zzl0

eden/scm/sapling/commands/subtree.py

@@ -5,10 +5,8 @@
 
 import contextlib
 import json
-import os
 import shutil
 import tempfile
-from collections import defaultdict
 from typing import List
 
 from .. import (

eden/scm/sapling/context.py

@@ -13,11 +13,9 @@
 
 import errno
 import filecmp
-import hashlib
 import os
 import re
 import stat
-import sys
 from functools import partial
 from typing import Callable, List, Optional, Tuple, Union
 

eden/scm/sapling/encoding.py

@@ -13,7 +13,6 @@
 
 import locale
 import os
-import sys
 import unicodedata
 
 import bindings

eden/scm/sapling/ext/snapshot/latest.py

@@ -3,18 +3,12 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2.
 
-from sapling import error, node
+from sapling import node
 from sapling.edenapi_upload import filetypefromfile
 from sapling.i18n import _
 
-from .createremote import (
-    getdefaultmaxuntrackedsize,
-    parsemaxuntracked,
-    parsemaxuntrackedbytes,
-    workingcopy,
-)
+from .createremote import workingcopy
 from .metalog import fetchlatestsnapshot
-from .update import fetchsnapshot
 
 
 def _isworkingcopy(ui, repo, snapshot, maxuntrackedsize, pats=None, opts=None):

eden/scm/sapling/httpclient/__init__.py

@@ -53,7 +53,6 @@
 import select
 import socket
 import ssl
-import sys
 
 from .. import util
 from . import _readers

eden/scm/sapling/pathutil.py

@@ -8,14 +8,12 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import errno
 import os
 import posixpath
-import stat
 
 import bindings
 
-from . import encoding, error, identity, util
+from . import encoding, error, util
 from .i18n import _
 
 

eden/scm/sapling/posix.py

@@ -15,7 +15,6 @@
 
 import errno
 import fcntl
-import getpass
 import grp
 import os
 import pwd