tests: update for git sometimes emitting 'Cloning into' on stderr

Tests failed with Git 2.1.0 .

kallithea/tests/other/manual_test_vcs_operations.py

@@ -200,8 +200,8 b' class TestVCSOperations(BaseTestCase):'
         clone_url = _construct_url(GIT_REPO)
         stdout, stderr = Command('/tmp').execute('git clone', clone_url)
 
-        assert 'Cloning into' in stdout
-        assert stderr == ''
+        assert 'Cloning into' in stdout + stderr
+        assert stderr == '' or stdout == ''
 
     def test_clone_wrong_credentials_hg(self):
         clone_url = _construct_url(HG_REPO, passwd='bad!')
@@ -532,5 +532,5 b' class TestVCSOperations(BaseTestCase):'
         clone_url = _construct_url(GIT_REPO)
         stdout, stderr = Command('/tmp').execute('git clone', clone_url)
 
-        assert 'Cloning into' in stdout
-        assert stderr == ''
+        assert 'Cloning into' in stdout + stderr
+        assert stderr == '' or stdout == ''