Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Remove hacking and friends from lower-constraints, they are not needed
for installation.

Change-Id: I5ae47a7b11ff29a301e440c15daf30db7738485b

glanceclient/common/http.py

@@ -177,7 +177,7 @@ class HTTPClient(_BaseHTTPClient):
             if kwargs.get('insecure', False) is True:
                 self.session.verify = False
             else:
-                if kwargs.get('cacert', None) is not '':
+                if kwargs.get('cacert', None) != '':
                     self.session.verify = kwargs.get('cacert', True)
 
             self.session.cert = (kwargs.get('cert_file'),

glanceclient/tests/functional/v1/test_readonly_glance.py

@@ -52,7 +52,7 @@ class SimpleReadOnlyGlanceClientTest(base.ClientTestBase):
         commands = []
         cmds_start = lines.index('Positional arguments:')
         cmds_end = lines.index('Optional arguments:')
-        command_pattern = re.compile('^ {4}([a-z0-9\-\_]+)')
+        command_pattern = re.compile(r'^ {4}([a-z0-9\-\_]+)')
         for line in lines[cmds_start:cmds_end]:
             match = command_pattern.match(line)
             if match:

glanceclient/tests/functional/v2/test_readonly_glance.py

@@ -72,7 +72,7 @@ class SimpleReadOnlyGlanceClientTest(base.ClientTestBase):
         commands = []
         cmds_start = lines.index('Positional arguments:')
         cmds_end = lines.index('Optional arguments:')
-        command_pattern = re.compile('^ {4}([a-z0-9\-\_]+)')
+        command_pattern = re.compile(r'^ {4}([a-z0-9\-\_]+)')
         for line in lines[cmds_start:cmds_end]:
             match = command_pattern.match(line)
             if match:

glanceclient/tests/unit/test_http.py

@@ -367,11 +367,11 @@ class TestClient(testtools.TestCase):
         self.assertTrue(mock_log.called, 'LOG.debug never called')
         self.assertTrue(mock_log.call_args[0],
                         'LOG.debug called with no arguments')
-        hd_regex = ".*\s-H\s+'\s*%s\s*:\s*%s\s*'.*" % (hd_name, hd_val)
+        hd_regex = r".*\s-H\s+'\s*%s\s*:\s*%s\s*'.*" % (hd_name, hd_val)
         self.assertThat(mock_log.call_args[0][0],
                         matchers.MatchesRegex(hd_regex),
                         'header not found in curl command')
-        body_regex = ".*\s-d\s+'%s'\s.*" % body
+        body_regex = r".*\s-d\s+'%s'\s.*" % body
         self.assertThat(mock_log.call_args[0][0],
                         matchers.MatchesRegex(body_regex),
                         'body not found in curl command')
@@ -390,12 +390,12 @@ class TestClient(testtools.TestCase):
         needles = {'key': key, 'cert': cert, 'cacert': cacert}
         for option, value in needles.items():
             if value:
-                regex = ".*\s--%s\s+('%s'|%s).*" % (option, value, value)
+                regex = r".*\s--%s\s+('%s'|%s).*" % (option, value, value)
                 self.assertThat(mock_log.call_args[0][0],
                                 matchers.MatchesRegex(regex),
                                 'no --%s option in curl command' % option)
             else:
-                regex = ".*\s--%s\s+.*" % option
+                regex = r".*\s--%s\s+.*" % option
                 self.assertThat(mock_log.call_args[0][0],
                                 matchers.Not(matchers.MatchesRegex(regex)),
                                 'unexpected --%s option in curl command' %
@@ -421,7 +421,7 @@ class TestClient(testtools.TestCase):
         self.assertTrue(mock_log.call_args[0],
                         'LOG.debug called with no arguments')
         self.assertThat(mock_log.call_args[0][0],
-                        matchers.MatchesRegex('.*\s-k\s.*'),
+                        matchers.MatchesRegex(r'.*\s-k\s.*'),
                         'no -k option in curl command')
 
     @mock.patch('glanceclient.common.http.LOG.debug')

glanceclient/tests/unit/v2/test_metadefs_namespaces.py

@@ -58,6 +58,7 @@ def _get_namespace_fixture(ns_name, rt_name=RESOURCE_TYPE1, **kwargs):
 
     return ns
 
+
 data_fixtures = {
     "/v2/metadefs/namespaces?limit=20": {
         "GET": (

glanceclient/tests/unit/v2/test_metadefs_objects.py

@@ -58,6 +58,7 @@ def _get_object_fixture(ns_name, obj_name, **kwargs):
 
     return obj
 
+
 data_fixtures = {
     "/v2/metadefs/namespaces/%s/objects" % NAMESPACE1: {
         "GET": (

glanceclient/tests/unit/v2/test_shell_v2.py

@@ -55,6 +55,8 @@ def schema_args(schema_getter, omit=None):
             'locations': {'type': 'string'},
             'copy_from': {'type': 'string'}}}
     return original_schema_args(my_schema_getter, omit)
+
+
 utils.schema_args = schema_args
 
 from glanceclient.v2 import shell as test_shell  # noqa

glanceclient/v2/shell.py

@@ -840,15 +840,15 @@ def do_image_reactivate(gc, args):
 @utils.arg('tag_value', metavar='<TAG_VALUE>',
            help=_('Value of the tag.'))
 def do_image_tag_update(gc, args):
-        """Update an image with the given tag."""
-        if not (args.image_id and args.tag_value):
-            utils.exit('Unable to update tag. Specify image_id and tag_value')
-        else:
-            gc.image_tags.update(args.image_id, args.tag_value)
-            image = gc.images.get(args.image_id)
-            image = [image]
-            columns = ['ID', 'Tags']
-            utils.print_list(image, columns)
+    """Update an image with the given tag."""
+    if not (args.image_id and args.tag_value):
+        utils.exit('Unable to update tag. Specify image_id and tag_value')
+    else:
+        gc.image_tags.update(args.image_id, args.tag_value)
+        image = gc.images.get(args.image_id)
+        image = [image]
+        columns = ['ID', 'Tags']
+        utils.print_list(image, columns)
 
 
 @utils.arg('image_id', metavar='<IMAGE_ID>',