Import reverse from django.urls rather than django.core.urlresolvers

Starting with Django 2 (which is the python3 version), the reverse and
reverse_lazy functions are located in the django.urls module rather than
django.core.urlresolvers. In Django>=1.10 (horizon depends on 1.11), these
functions are available in django.urls. This commit aims at improving the
python3 compatibility.

Change-Id: I8e8d281c7cac21c4b5771d2430f7d376b7e8c46a

cloudkittydashboard/dashboards/admin/hashmap/tables.py

@@ -13,7 +13,7 @@
 #    under the License.
 
 from collections import OrderedDict
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
 

cloudkittydashboard/dashboards/admin/hashmap/views.py

@@ -13,8 +13,8 @@
 #    under the License.
 
 
-from django.core.urlresolvers import reverse
-from django.core.urlresolvers import reverse_lazy
+from django.urls import reverse
+from django.urls import reverse_lazy
 from django.utils.translation import ugettext_lazy as _
 from horizon import forms
 from horizon import tables

cloudkittydashboard/dashboards/admin/modules/tables.py

@@ -12,7 +12,7 @@
 #    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.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
 

cloudkittydashboard/dashboards/admin/modules/views.py

@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from django.core.urlresolvers import reverse
-from django.core.urlresolvers import reverse_lazy
+from django.urls import reverse
+from django.urls import reverse_lazy
 from django.utils.translation import ugettext_lazy as _
 from horizon import forms
 from horizon import tables

cloudkittydashboard/dashboards/admin/pyscripts/tables.py

@@ -12,7 +12,7 @@
 #    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.translation import ugettext_lazy as _
 from django.utils.translation import ungettext_lazy
 

cloudkittydashboard/dashboards/admin/pyscripts/views.py

@@ -12,8 +12,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from django.core.urlresolvers import reverse
-from django.core.urlresolvers import reverse_lazy
+from django.urls import reverse
+from django.urls import reverse_lazy
 from django.utils.translation import ugettext_lazy as _
 from horizon import forms
 from horizon import tables

cloudkittydashboard/dashboards/admin/summary/tables.py

@@ -12,7 +12,7 @@
 #    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.translation import ugettext_lazy as _
 
 from horizon import tables