Trigger new model generation on NSI state machine transition.

[jmacauley]

Generation of new models is on a timer and assembled based on the results of a NSI summary query operation. This means model updates are only detected when this timer kicks the process. This causes two issues:

1. Delay in the SENSE-O detecting a model update for their delta commit.
2. Reducing the model audit timer results in a heavier load being generated on the NSA.

Add new model generation for major NSI reservation state machine transitions that impact MRML mode generation. This should be generated off of the update itself and not another NSI query.

The major NSI events are:

a) After the delta commit (reserveCommit -> provision sequence, or a terminate sequence).
b) dataPlaneStateChange event.

This will also require a new message type for the ConnectionActor to trigger a this MRML model generation.