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_inner.py

@@ -1,22 +1,26 @@
 #!/usr/bin/env python3
-import os
-import sys
 import argparse
 import glob
+import os
 import shutil
-
+import sys
 from typing import List
 
 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, OKBLUE, ENDC, \
-    get_dev_uuid_var_path, is_digest_obsolete, write_new_digest
-
-from version import PROVISION_VERSION
 from pygments import __version__ as pygments_version
 
+from scripts.lib.zulip_tools import (
+    ENDC,
+    OKBLUE,
+    get_dev_uuid_var_path,
+    is_digest_obsolete,
+    run,
+    write_new_digest,
+)
 from tools.setup.generate_zulip_bots_static_files import generate_zulip_bots_static_files
+from version import PROVISION_VERSION
 
 VENV_PATH = "/srv/zulip-py3-venv"
 UUID_VAR_PATH = get_dev_uuid_var_path()
@@ -177,7 +181,7 @@ def clean_unused_caches() -> None:
         verbose=False,
         no_headings=True,
     )
-    from scripts.lib import clean_venv_cache, clean_node_cache, clean_emoji_cache
+    from scripts.lib import clean_emoji_cache, clean_node_cache, clean_venv_cache
     clean_venv_cache.main(args)
     clean_node_cache.main(args)
     clean_emoji_cache.main(args)
@@ -227,12 +231,13 @@ def main(options: argparse.Namespace) -> int:
         import django
         django.setup()
 
+        from django.conf import settings
+
         from zerver.lib.test_fixtures import (
             DEV_DATABASE,
             TEST_DATABASE,
             destroy_leaked_test_databases,
         )
-        from django.conf import settings
 
         if options.is_force or need_to_run_configure_rabbitmq(
                 [settings.RABBITMQ_PASSWORD]):