Fix more cros lint issues in chromite/scripts.

Actually, just addresses issues vapier rased mid-CQ run.

BUG=None
TEST=Ran cros lint.

Change-Id: Id6f517c83ad3dd5041cef0ba59fbab84f278bba5
Reviewed-on: https://chromium-review.googlesource.com/190991
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
diff --git a/scripts/parallel_emerge.py b/scripts/parallel_emerge.py
index 40b5db8..258af88 100644
--- a/scripts/parallel_emerge.py
+++ b/scripts/parallel_emerge.py
@@ -79,6 +79,7 @@
 import portage
 import portage.debug
 from portage.versions import vercmp
+# pylint: enable=F0401
 
 
 def Usage():