Cinder consistency group has been replaced by the generic group feature.
Horizon support of the generic group (in the project dashboard) is
available since Rocky release and it covers all existing support
for consistency group in horizon.
The consistency group support is horizon was marked as deprecated
in Stein release [1].
This commit drops the consistency group support.
[1] https://review.openstack.org/#/c/626846/
Change-Id: I11187d2b03b7e0033a6c6ba3f8be25b8b5e4dd74
(In Django 2.0) The django.core.urlresolvers module is removed
in favor of its new location, django.urls.
It was depreacted in Django 1.10:
https://docs.djangoproject.com/en/2.0/releases/1.10/#id3
blueprint django2-support
Change-Id: I46ab5c325491274b8eaffbf848e5d80f83c2fd26
Akihiro Motoki