Implement polling strategy (maybe?)

[ognjenkatic]

Quoting existing TODO from code:

// TODO: Implement polling strategy so that if there // are no requests incoming we poll less, and when queues are full // we poll more often

This basically means that when there is a high load we poll more often and when there is no load we extend the polling interval to be kind to conductor (as there are many microservices individually polling it).

I am not 100% sure this would make much of a difference as we cannot allot a too long polling interval (5s+) because new tasks would end up waiting a lot. We did notice in production scenarios that conductor is affected by heavy polling.

[boma96]

@ognjenkatic This is implemented?