format: python: normalize space after module docstring

Black allows people to omit blank lines, or insert extra ones.
Normalize it for CrOS to a single blank line.

BUG=None
TEST=CQ passes

Change-Id: Ifc3085ec7947b67d17c74f950515297494898dfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4844368
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Tim Bain <tbain@google.com>
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Tim Bain <tbain@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/strip_package_unittest.py b/scripts/strip_package_unittest.py
index 87fd8e9..6937c1d 100644
--- a/scripts/strip_package_unittest.py
+++ b/scripts/strip_package_unittest.py
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 """Unittests for strip_package.py"""
+
 import os
 
 from chromite.lib import build_target_lib