Listening for snappy events on snapd interface

[Robert Ancell]

Hi,

The snapd interface currently allows an application to poll for the state
of the snaps on a system either by getting the list of installed snaps or
polling for the result of an async operation (e.g. install / remove).

It would be desirable to be able to subscribe to an event stream on the
snapd interface so you could track all changes without polling. This would
make:
- Code more efficient by removing the need to poll your own async operations
- A snapd client able to know when a separate client has installed /
removed / changed state of a snap.

For example if you do the folowing request to snapd:
GET /2.0/events
(snapd blocks)
(a client installs hello-world.canonical)
(snapd returns)
{"snaps":{"hello-world.canonical":{"status":"installed"}}

Does this feature make sense for snapd?

--Robert
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