[PATCH 1 of 5] tests: remove unused import from 'f' utility

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1463276384 -32400
#      Sun May 15 10:39:44 2016 +0900
# Node ID 23d1fdaa1d6407ba3c683716ca79e99f53daa4a1
# Parent  2f9ad6ca19c27744f0afa132d857dc2bba4127aa
tests: remove unused import from 'f' utility

It should have been caught by pyflakes.

diff --git a/tests/f b/tests/f
--- a/tests/f
+++ b/tests/f
@@ -25,7 +25,6 @@ This can be used instead of tools like:
 
 from __future__ import absolute_import
 
-import errno
 import glob
 import optparse
 import os