Change description of default security group

The description for default security group in neutron
is “default”.
This confuses the end users, so updated the description
from “default” to “Default security group”.
Closes-Bug: #1291570

Change-Id: I9e024de935e8d17afd3d459cfa17e9feb0cd79fa

neutron/db/securitygroups_db.py

@@ -507,9 +507,11 @@ class SecurityGroupDbMixin(ext_sg.SecurityGroupPluginBase):
         default_group = self.get_security_groups(context, filters,
                                                  default_sg=True)
         if not default_group:
-            security_group = {'security_group': {'name': 'default',
-                                                 'tenant_id': tenant_id,
-                                                 'description': 'default'}}
+            security_group = {
+                'security_group': {'name': 'default',
+                                   'tenant_id': tenant_id,
+                                   'description': _('Default security group')}
+            }
             ret = self.create_security_group(context, security_group, True)
             return ret['id']
         else:

neutron/tests/unit/test_extension_security_group.py

@@ -319,6 +319,13 @@ class TestSecurityGroups(SecurityGroupDBTestCase):
             self.assertEqual(res['security_group']['description'],
                              data['security_group']['description'])
 
+    def test_check_default_security_group_description(self):
+        with self.network():
+            res = self.new_list_request('security-groups')
+            sg = self.deserialize(self.fmt, res.get_response(self.ext_api))
+            self.assertEqual('Default security group',
+                             sg['security_groups'][0]['description'])
+
     def test_default_security_group(self):
         with self.network():
             res = self.new_list_request('security-groups')