Fix deprecation warnings for Django 1.11 and Django 2.0.

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

mayan/apps/user_management/tests/test_api.py

@@ -2,7 +2,7 @@ from __future__ import unicode_literals
 
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from rest_api.tests import BaseAPITestCase
 

mayan/apps/user_management/views.py

@@ -4,9 +4,9 @@ from django.contrib import messages
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
 from django.contrib.contenttypes.models import ContentType
-from django.core.urlresolvers import reverse, reverse_lazy
 from django.http import HttpResponseRedirect
 from django.shortcuts import get_object_or_404
+from django.urls import reverse, reverse_lazy
 from django.utils.translation import ungettext, ugettext_lazy as _
 
 from common.views import (