Refactor infra git libs and testing.

infra/libs/git2/data/test/commit_test.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import collections
 import textwrap
 import unittest
 
-from infra.services.gnumbd.support import data
+from infra.libs.git2 import data
 
 class TestCommitTimestamp(unittest.TestCase):
   def testBasic(self):
     TS = '1399330903 -0700'
     t = data.CommitTimestamp.from_raw(TS)
     self.assertEqual(1399330903, t.secs)
     self.assertEqual(7, t.hours)
     self.assertEqual(0, t.mins)
     self.assertEqual('-', t.sign)
     self.assertEqual('-0700', t.tz_str)
@@ skipping 413 matching lines @@
   def testPartial(self):
     COMMIT = textwrap.dedent("""\
     tree deadbeefdeadbeefdeadbeefdeadbeefdeadbeef
     """)
     with self.assertRaises(data.PartialCommit):
       data.CommitData.from_raw(COMMIT)
 
   def testEmpty(self):
     with self.assertRaises(data.PartialCommit):
       data.CommitData.from_raw('')