python: Sort imports with isort.

Fixes #2665.

Regenerated by tabbott with `lint --fix` after a rebase and change in
parameters.

Note from tabbott: In a few cases, this converts technical debt in the
form of unsorted imports into different technical debt in the form of
our largest files having very long, ugly import sequences at the
start.  I expect this change will increase pressure for us to split
those files, which isn't a bad thing.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

tools/lib/provision.py

@@ -1,28 +1,37 @@
 #!/usr/bin/env python3
-import os
-import sys
-import logging
 import argparse
+import hashlib
+import logging
+import os
 import platform
 import subprocess
-import hashlib
+import sys
 
 os.environ["PYTHONUNBUFFERED"] = "y"
 
 ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
 sys.path.append(ZULIP_PATH)
-from scripts.lib.zulip_tools import run_as_root, ENDC, WARNING, \
-    get_dev_uuid_var_path, FAIL, os_families, parse_os_release, \
-    overwrite_symlink
+from typing import TYPE_CHECKING, List
+
+from scripts.lib.node_cache import NODE_MODULES_CACHE_PATH, setup_node_modules
 from scripts.lib.setup_venv import (
-    get_venv_dependencies, THUMBOR_VENV_DEPENDENCIES,
+    THUMBOR_VENV_DEPENDENCIES,
     YUM_THUMBOR_VENV_DEPENDENCIES,
+    get_venv_dependencies,
+)
+from scripts.lib.zulip_tools import (
+    ENDC,
+    FAIL,
+    WARNING,
+    get_dev_uuid_var_path,
+    os_families,
+    overwrite_symlink,
+    parse_os_release,
+    run_as_root,
 )
-from scripts.lib.node_cache import setup_node_modules, NODE_MODULES_CACHE_PATH
 from tools.setup import setup_venvs
 
-from typing import List, TYPE_CHECKING
 if TYPE_CHECKING:
     from typing import NoReturn