isort: format codebase

Change-Id: I6f11d123b68fd077f558d3c21349c55c5f251019
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/383715
Reviewed-by: Gavin Mak <gavinmak@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Mike Frysinger <vapier@google.com>

release/update-manpages

@@ -22,4 +22,5 @@ import sys
 
 import update_manpages
 
+
 sys.exit(update_manpages.main(sys.argv[1:]))

release/update_manpages.py

@@ -17,17 +17,18 @@
 Most code lives in this module so it can be unittested.
 """
 
-from pathlib import Path
 import argparse
 import functools
 import multiprocessing
 import os
+from pathlib import Path
 import re
 import shutil
 import subprocess
 import sys
 import tempfile
 
+
 TOPDIR = Path(__file__).resolve().parent.parent
 MANDIR = TOPDIR.joinpath("man")