Remove six.PY3

The Python 2.7 Support has been dropped since Ussuri.
So remove hacking rules for compatibility between python 2 and 3.

Change-Id: Id3fd78b5d3e21579975ea0d0fc65e4f66ea4582e

integration/tests/integration/int_tests.py

@@ -70,10 +70,7 @@ def add_support_for_localization():
     if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
         sys.path.insert(0, possible_topdir)
 
-    if six.PY3:
-        gettext.install('nova')
-    else:
-        gettext.install('nova', unicode=True)
+    gettext.install('nova')
 
 
 MAIN_RUNNER = None

integration/tests/integration/tests/colorizer.py

@@ -59,14 +59,10 @@ import heapq
 import logging
 import os
 import unittest
-import six
 import sys
 import time
 
-if six.PY3:
-    gettext.install('nova')
-else:
-    gettext.install('nova', unicode=True)
+gettext.install('nova')
 
 from nose import config
 from nose import core

run_tests.py

@@ -25,7 +25,6 @@ import traceback
 import eventlet
 from oslo_log import log as logging
 import proboscis
-import six
 from six.moves import urllib
 import wsgi_intercept
 from wsgi_intercept.httplib2_intercept import install as wsgi_install
@@ -57,10 +56,7 @@ def add_support_for_localization():
     if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
         sys.path.insert(0, possible_topdir)
 
-    if six.PY3:
-        gettext.install('nova')
-    else:
-        gettext.install('nova', unicode=True)
+    gettext.install('nova')
 
 
 def initialize_trove(config_file):

trove/dns/designate/driver.py

@@ -25,7 +25,6 @@ from keystoneauth1 import loading
 from keystoneauth1 import session
 from oslo_log import log as logging
 from oslo_utils import encodeutils
-import six
 
 from trove.common import cfg
 from trove.common import exception
@@ -110,8 +109,7 @@ class DesignateInstanceEntryFactory(driver.DnsInstanceEntryFactory):
         name = encodeutils.to_utf8(instance_id)
         name = hashlib.md5(name).digest()
         name = base64.b32encode(name)[:11].lower()
-        if six.PY3:
-            name = name.decode('ascii')
+        name = name.decode('ascii')
         hostname = ("%s.%s" % (name, zone.name))
         # Removing the leading dot if present
         if hostname.endswith('.'):

trove/tests/fakes/swift.py

@@ -108,10 +108,7 @@ class FakeSwiftConnection(object):
                 object_checksum = md5(self.container_objects[object_name])
                 # The manifest file etag for a HEAD or GET is the checksum of
                 # the concatenated checksums.
-                if six.PY3:
-                    checksum.update(object_checksum.hexdigest().encode())
-                else:
-                    checksum.update(object_checksum.hexdigest())
+                checksum.update(object_checksum.hexdigest().encode())
             # this is included to test bad swift segment etags
             if name.startswith("bad_manifest_etag_"):
                 return {'etag': '"this_is_an_intentional_bad_manifest_etag"'}

trove/tests/unittests/api/common/test_limits.py

@@ -600,8 +600,7 @@ class FakeHttplibConnection(object):
 
         resp = str(req.get_response(self.app))
         resp = "HTTP/1.0 %s" % resp
-        if six.PY3:
-            resp = resp.encode("utf-8")
+        resp = resp.encode("utf-8")
         sock = FakeHttplibSocket(resp)
         self.http_response = http_client.HTTPResponse(sock)
         self.http_response.begin()

trove/tests/unittests/domain-name-service/test_designate_driver.py

@@ -16,7 +16,6 @@ import hashlib
 
 from unittest.mock import MagicMock
 from unittest.mock import patch
-import six
 
 from trove.common import exception
 from trove.dns.designate import driver
@@ -89,8 +88,7 @@ class DesignateInstanceEntryFactoryTest(trove_testtools.TestCase):
         driver.DNS_TTL = 3600
         hashed_id = hashlib.md5(instance_id.encode()).digest()
         hashed_id = base64.b32encode(hashed_id)
-        if six.PY3:
-            hashed_id = hashed_id.decode('ascii')
+        hashed_id = hashed_id.decode('ascii')
         hashed_id_concat = hashed_id[:11].lower()
         exp_hostname = ("%s.%s" % (hashed_id_concat, driver.DNS_DOMAIN_NAME))
         factory = driver.DesignateInstanceEntryFactory()
@@ -109,8 +107,7 @@ class DesignateInstanceEntryFactoryTest(trove_testtools.TestCase):
         driver.DNS_TTL = 3600
         hashed_id = hashlib.md5(instance_id.encode()).digest()
         hashed_id = base64.b32encode(hashed_id)
-        if six.PY3:
-            hashed_id = hashed_id.decode('ascii')
+        hashed_id = hashed_id.decode('ascii')
         hashed_id_concat = hashed_id[:11].lower()
         exp_hostname = ("%s.%s" %
                         (hashed_id_concat, driver.DNS_DOMAIN_NAME))[:-1]