Use eager start for august subscriber refreshes

[bdraco]

Proposed change

Since most of the time this call will be a noop since pubnub will be connected we can avoid scheduling a task on the event loop every time it fires

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[balloob]

Should there be an eager keyword for our listeners, or maybe a decorator for the functions we pass in ?

[bdraco]

I was thinking decorate coros like we do with @callback but I think after the initial flood of these we won't have that many. If I turn out to be wrong on that, I think I'll switch gears and add the decorator, but I don't want to put more checks in the HassJob path if it's not going to be more generally used