Use the default queue when calling create_deployment_plan

This change happened in tripleoclient[1], but never in instack-undercloud.
Using a uuid queue name means a queue is left in Zaqar but never used
- we don't consume the messages from it or delete the queue.

[1]: https://git.openstack.org/cgit/openstack/python-tripleoclient/commit/?id=1bd1620eadf23f2ee755a32a8167d9a5386a392e

Closes-Bug: #1757387
Change-Id: I5d39200e7292a5c1750601ec0669f462e7b1c164

instack_undercloud/tests/test_undercloud.py

@@ -1068,7 +1068,6 @@ class TestPostConfig(BaseTestCase):
             'tripleo.plan_management.v1.create_deployment_plan',
             workflow_input={
                 'container': 'overcloud',
-                'queue_name': mock.ANY,
                 'use_default_templates': True,
             }
         )

instack_undercloud/undercloud.py

@@ -1877,7 +1877,6 @@ def _run_validation_groups(groups=[], mistral_url='', timeout=540,
 
 def _create_default_plan(mistral, plans, timeout=360):
     plan_name = 'overcloud'
-    queue_name = str(uuid.uuid4())
 
     if plan_name in plans:
         LOG.info('Not creating default plan "%s" because it already exists.',
@@ -1888,7 +1887,6 @@ def _create_default_plan(mistral, plans, timeout=360):
         'tripleo.plan_management.v1.create_deployment_plan',
         workflow_input={
             'container': plan_name,
-            'queue_name': queue_name,
             'use_default_templates': True,
         }
     )