Deleting an octavia load-balancer in Red Hat OpenStack Platform 13 fails with `delete_load_balancer() got an unexpected keyword argument 'cascade'`

Solution In Progress - Updated -

Issue

Deleting an octavia load-balancer in Red Hat OpenStack Platform 13 fails with delete_load_balancer() got an unexpected keyword argument 'cascade':

/var/log/containers/horizon/horizon.log

2019-08-27 13:36:35,785 61 ERROR openstack_dashboard.api.rest.utils error invoking apiclient
Traceback (most recent call last):
  File "/usr/share/openstack-dashboard/openstack_dashboard/api/rest/utils.py", line 127, in _wrapped
    data = function(self, request, *args, **kw)
  File "/usr/lib/python2.7/site-packages/octavia_dashboard/api/rest/lbaasv2.py", line 648, in delete
    cascade=True)
TypeError: delete_load_balancer() got an unexpected keyword argument 'cascade'

Environment

Red Hat OpenStack Platform 13

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