cloudkitty-processor fails to start due to UnboundLocalError in orchestrator.py

[Marius L]

While trying to run the "master" branch of cloudkitty, the cloudkitty-processor service
throws the following error on start:

 Traceback (most recent call last):
   File "/var/lib/kolla/venv/bin/cloudkitty-processor", line 10, in <module>
     sys.exit(main())
   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/cloudkitty/cli/processor.py", line 32, in main
     processor.process()
   File "/var/lib/kolla/venv/local/lib/python2.7/site-packages/cloudkitty/orchestrator.py", line 305, in process
     eventlet.sleep(tenant['period'])
 UnboundLocalError: local variable 'tenant' referenced before assignment
2018-06-28 15:14:30.547 6 ERROR cloudkitty

On this line `eventlet.sleep(tenant['period'])` tenant is an undefined variable.