[py3k] Import unquote from six.moves

Related to #268148.

test/unittest_engine.py

@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with logilab-mtconverter. If not, see <http://www.gnu.org/licenses/>.
 from logilab.common.testlib import TestCase, unittest_main
-import urllib
+from six.moves.urllib.parse import unquote as url_unquote
 import re
 import os.path as osp
 
@@ -33,7 +33,7 @@ class HtmlToText(Transform):
 
     def __call__(self, orig):
         orig = re.sub('<[^>]*>(?i)(?m)', '', orig)
-        return urllib.unquote(re.sub('\n+', '\n', orig)).strip()
+        return url_unquote(re.sub('\n+', '\n', orig)).strip()
 
     def _convert(self, data):
         return self.__call__(data.data)
@@ -47,7 +47,7 @@ class FooToBar(Transform):
 
     def __call__(self, orig):
         orig = re.sub('foo', 'bar', orig)
-        return urllib.unquote(re.sub('\n+', '\n', orig)).strip()
+        return url_unquote(re.sub('\n+', '\n', orig)).strip()
 
     def _convert(self, data):
         return self.__call__(data.data)