Senlin rally job is broken

[Duc Truong]

The senlin rally task create-and-delete-profile-cluster.json is broken when running against latest senlin code:

2018-02-27 17:58:19.411 5281 ERROR rally.task.context [-] Task 6a9c4a13-a4d8-4e5f-9bb8-ce8861a29849 | Context profiles@openstack cleanup() failed after 0.34 msec: KeyError: 'profile'
2018-02-27 17:58:19.411 5281 ERROR rally.task.context Traceback (most recent call last):
2018-02-27 17:58:19.411 5281 ERROR rally.task.context File "/opt/stack/rally/rally/task/context.py", line 276, in cleanup
2018-02-27 17:58:19.411 5281 ERROR rally.task.context ctx.cleanup()
2018-02-27 17:58:19.411 5281 ERROR rally.task.context File "/opt/stack/rally/rally/plugins/openstack/context/senlin/profiles.py", line 73, in cleanup
2018-02-27 17:58:19.411 5281 ERROR rally.task.context self.context["tenants"][tenant_id]["profile"])
2018-02-27 17:58:19.411 5281 ERROR rally.task.context KeyError: 'profile'
2018-02-27 17:58:19.411 5281 ERROR rally.task.context
2018-02-27 17:58:19.412 5281 INFO rally.task.context [-] Task 6a9c4a13-a4d8-4e5f-9bb8-ce8861a29849 | Context users@openstack cleanup() started
2018-02-27 17:58:20.563 5281 INFO rally.task.context [-] Task 6a9c4a13-a4d8-4e5f-9bb8-ce8861a29849 | Context users@openstack cleanup() finished in 1.15 sec
2018-02-27 17:58:21.019 5281 INFO rally.task.engine [-] Load duration is: 0.0
2018-02-27 17:58:21.019 5281 INFO rally.task.engine [-] Full runner duration is: 0.0
2018-02-27 17:58:21.020 5281 INFO rally.task.engine [-] Full duration is: 1.555766
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine [-] Unexpected exception during the workload execution: ImportError: cannot import name client
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine Traceback (most recent call last):
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/task/engine.py", line 507, in _run_workload
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine with ctx_manager:
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/task/context.py", line 295, in __enter__
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine self.setup()
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/task/context.py", line 240, in setup
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine ctx.setup()
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/plugins/openstack/context/senlin/profiles.py", line 56, in setup
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine profile = senlin_scenario._create_profile(self.config)
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/task/atomic.py", line 91, in func_atomic_actions
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine f = func(self, *args, **kwargs)
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/plugins/openstack/scenarios/senlin/utils.py", line 135, in _create_profile
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine return self.clients("senlin").create_profile(**attrs)
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/plugins/openstack/scenario.py", line 104, in clients
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine return client(version) if version is not None else client()
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/plugins/openstack/osclients.py", line 203, in __call__
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine self.cache[key] = self.create_client(*args, **kwargs)
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine File "/opt/stack/rally/rally/plugins/openstack/osclients.py", line 737, in create_client
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine from senlinclient import client as senlin
2018-02-27 17:58:21.033 5281 ERROR rally.task.engine ImportError: cannot import name client

Steps to reproduce:
* Get latest rally code in devstack
* Get latest senlin code in devstack
* Run rally senlin task:
rally task start /opt/stack/rally/samples/tasks/scenarios/senlin/create-and-delete-profile-cluster.json