Django 2.0 support

Replace django.core.urlresolves with django.urls

(In Django 2.0) The django.core.urlresolvers module is removed
in favor of its new location, django.urls.
It was deprecated in Django 1.10:
https://docs.djangoproject.com/en/2.0/releases/1.10/#id3

Note that this commit does not add py35dj20 like other horizon plugins
because there is no actual python unit tests in freezer-web-ui.

Older Django unit tests were dropped from tox.ini
as horizon dropped Django <=1.10 support in Rocky.

Change-Id: I38f3f05655324f2a5f38c6e8c6ab53ebaa42d4c8

disaster_recovery/actions/tables.py

@@ -15,7 +15,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
 
 from horizon import tables
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 import disaster_recovery.api.api as freezer_api
 

disaster_recovery/actions/views.py

@@ -12,7 +12,7 @@
 
 import pprint
 
-from django.core.urlresolvers import reverse_lazy
+from django.urls import reverse_lazy
 from django.utils.translation import ugettext_lazy as _
 from django.views import generic
 

disaster_recovery/backups/tables.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.utils import safestring
 from django.utils.translation import ungettext_lazy
 from django.utils.translation import ugettext_lazy as _

disaster_recovery/clients/tables.py

@@ -14,7 +14,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
 
 from horizon import tables
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 import disaster_recovery.api.api as freezer_api
 from disaster_recovery.utils import shield

disaster_recovery/jobs/tables.py

@@ -18,7 +18,7 @@ from django.utils.translation import ungettext_lazy
 
 from horizon import tables
 from horizon import messages
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 import disaster_recovery.api.api as freezer_api
 from disaster_recovery.utils import shield

disaster_recovery/sessions/tables.py

@@ -14,7 +14,7 @@
 
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from horizon import tables
 

disaster_recovery/sessions/workflows/attach.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 from django.utils.translation import ugettext_lazy as _
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 
 from horizon import exceptions
 from horizon import forms

disaster_recovery/sessions/workflows/create.py

@@ -14,7 +14,7 @@
 
 import datetime
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 
 

disaster_recovery/utils.py

@@ -17,7 +17,7 @@ import re
 
 from functools import wraps
 
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.template.defaultfilters import date as django_date
 from django.utils.translation import ugettext_lazy as _
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py27dj18,pep8,py35,py35dj18,pylint
+envlist = py27,pep8,py35,pylint
 minversion = 1.6
 skipsdist = True
 
@@ -25,17 +25,6 @@ commands = {posargs}
 [testenv:cover]
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
-[testenv:py27dj18]
-basepython = python2.7
-commands =
-    python manage.py test {posargs}
-
-
-[testenv:py35dj18]
-basepython = python3.5
-commands =
-    python manage.py test {posargs}
-
 [testenv:docs]
 setenv = DJANGO_SETTINGS_MODULE=disaster_recovery.test.settings
 commands = python setup.py build_sphinx