[PATCH] convert: delete unused imports in git.py

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at google.com>
# Date 1459273773 25200
#      Tue Mar 29 10:49:33 2016 -0700
# Node ID 10a9e542a72358e7372ca4d4c320d085e36d08dd
# Parent  ff0d3b6b287f89594bd8d0308fe2810d2a18ea01
convert: delete unused imports in git.py

As reported by pyflakes

diff -r ff0d3b6b287f -r 10a9e542a723 hgext/convert/git.py
--- a/hgext/convert/git.py	Tue Mar 29 12:29:00 2016 -0500
+++ b/hgext/convert/git.py	Tue Mar 29 10:49:33 2016 -0700
@@ -7,12 +7,10 @@
 from __future__ import absolute_import
 
 import os
-import subprocess
 from mercurial import (
     config,
     error,
     node as nodemod,
-    util,
 )
 from mercurial.i18n import _