Fix unicode isue

In Python 3, all string is unicode.
Replace unicode() with six.u()
Make use of strutils.to_slug() for slugify() definition

Partial implements: blueprint py33-support

Change-Id: I6a1e19c095a2fbafcbe47b34c7af17e1b0353b9e

troveclient/tests/test_utils.py

@@ -1,4 +1,5 @@
 import os
+import six
 from testtools import TestCase
 from troveclient import utils
 
@@ -36,5 +37,5 @@ class UtilsTest(TestCase):
         import unicodedata  # noqa
 
         self.assertEqual('not_unicode', utils.slugify('not_unicode'))
-        self.assertEqual('unicode', utils.slugify(unicode('unicode')))
+        self.assertEqual('unicode', utils.slugify(six.u('unicode')))
         self.assertEqual('slugify-test', utils.slugify('SLUGIFY% test!'))

troveclient/utils.py

@@ -224,10 +224,7 @@ def slugify(value):
     and converts spaces to hyphens.
 
     From Django's "django/template/defaultfilters.py".
+
+    Make use strutils.to_slug from openstack common
     """
-    import unicodedata
-    if not isinstance(value, unicode):
-        value = unicode(value)
-    value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
-    value = unicode(_slugify_strip_re.sub('', value).strip().lower())
-    return _slugify_hyphenate_re.sub('-', value)
+    return strutils.to_slug(value, incoming=None, errors="strict")