Update Python runner to parse action result and store it in a dictionary
under the key "result".

This way result is not only accessible through "stdout" key anymore and it's
not mixed with other stdout output.
Fix a typo.
Update affected python action runner tests.
queue watcher -> queue consumer.
Add "queue producer" debug utility which allows user to send test messages to a
particular exchange.
Fix a typo.
Add back accidentaly removed trigger watcher code.
Start watcher before running sensor setup code.
Use the correct variable name.
Log actual exception message.
Log a message when calling sensor trigger handler methods.
Log exception when message handling fails.
Remove now used and deprecated SensorContainer class.
MultiProcessSensorContainer -> ProcessSensorContainer.
Update ContainerManager to publish "trigger create" Trigger CUD events for all
the existing Trigger objects in the database.

Those events are handled inside the sensor wrapper.