Remove password_reset and own login, redirect to admin/login

Django admin login to be used. Thus we should be able to upgrade to
Django2.0

members/views/utils.py

@@ -95,7 +95,7 @@ def convert_table_to_html(table, request):
 
 @ensure_csrf_cookie
 @require_http_methods(["GET"])
-@login_required(login_url='/login')
+@login_required(login_url='/admin/login')
 @permission_required('members.change_member', raise_exception=True)
 def settings_page(request, *args, **kwargs):
     """Render member app settings page."""
@@ -104,7 +104,7 @@ def settings_page(request, *args, **kwargs):
 
 @ensure_csrf_cookie
 @require_http_methods(["POST"])
-@login_required(login_url='/login')
+@login_required(login_url='/admin/login')
 @permission_required(['members.change_member', 'members.change_payment'], raise_exception=True)
 def import_csv(request, *args, **kwargs):
     """Get csv data imported to page and create members based on that."""