Fix deprecation warnings for Django 1.11 and Django 2.0.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/tests/test_api.py

@@ -1,6 +1,6 @@
 from __future__ import unicode_literals
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from rest_api.tests import BaseAPITestCase
 

mayan/apps/common/tests/test_views.py

@@ -3,9 +3,9 @@ from __future__ import absolute_import, unicode_literals
 from django.conf.urls import url
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
-from django.core.urlresolvers import clear_url_caches, reverse
 from django.http import HttpResponse
 from django.template import Context, Template
+from django.urls import clear_url_caches, reverse
 
 from acls.models import AccessControlList
 from permissions.models import Role
@@ -91,7 +91,7 @@ class GenericViewTestCase(BaseTestCase):
         user = get_user_model().objects.get(username=username)
 
         self.assertTrue(logged_in)
-        self.assertTrue(user.is_authenticated())
+        self.assertTrue(user.is_authenticated)
 
     def login_user(self):
         self.login(username=TEST_USER_USERNAME, password=TEST_USER_PASSWORD)