standardize file style

Minor fixups:
 - don't use shebangs on non-executable files
 - drop +x from files that don't need it
 - fix blank line spacing
 - fix typos in a few module docstrings

BUG=chromium:414895
TEST=`./cbuildbot/run_tests` passes

Change-Id: Idbce70b406254fbfcd5efa4beff2b1d5aa058d11
Reviewed-on: https://chromium-review.googlesource.com/218571
Reviewed-by: David James <davidjames@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/loman.py b/scripts/loman.py
index da1fd0a..d0c510f 100644
--- a/scripts/loman.py
+++ b/scripts/loman.py
@@ -10,6 +10,7 @@
 import os
 import sys
 import xml.etree.ElementTree as ElementTree
+
 from chromite.lib import cros_build_lib
 from chromite.lib import git