Add properties to on_deliver hook, so that it can be used also for v3 clients

[mths1]

Add properties to on_deliver hook, so that it can be used also for v3 clients

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[ioolkos]

@mths1 interesting... what use case do you have in mind?

[mths1]

As discussed it is more or less the same use-case as described here already: #1098

[mths1]

Seems to be good now. Needs a little change to vernemq_dev before it is really finished.

[ioolkos]

@mths1 do you have a PR for vernemq_dev, or should I do it?

[mths1]

Didn't see that you already merged. We also need to uncomment the following once the vernemq_dev change is done. I'll prepare a pull request (for both):

%-behaviour(on_deliver_hook).