Ansible launcher: send ZMQ start/complete events

We have a lot of infrastructure expecting ZMQ events related to
job start/stops.  Send them.

Note, when the ansible launcher shuts down, it will send fake
completion events for each node it has so that nodepool will
delete those nodes.

Change-Id: Ib38c5c77452743a49f6d1cda69c914b5d491134b
1 file changed