[PATCH 1 of 3 hglib] client: remove unused imports

[Gregory Szorc]

# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1467839462 25200
#      Wed Jul 06 14:11:02 2016 -0700
# Node ID 2e5f8d01dc59ca4ed1314a66283cc05b2c32cf3a
# Parent  c67410c747238f9d40b63f17e037552da85643d2
client: remove unused imports

diff --git a/hglib/client.py b/hglib/client.py
--- a/hglib/client.py
+++ b/hglib/client.py
@@ -1,9 +1,9 @@
-import subprocess, os, struct, re, datetime
+import struct, re, datetime
 import hglib
 from hglib import error, util, templates, merge, context
 
 from hglib.util import b, cmdbuilder, BytesIO, strtobytes
 
 class revision(tuple):
     def __new__(cls, rev, node, tags, branch, author, desc, date):
         return tuple.__new__(cls, (rev, node, tags, branch, author, desc, date))