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fix: make eventqueue sink interruptable

Pawel Rozlach requested to merge prozlach/1349-make_eventqueu_interruptable into master

What does this MR do?

Related to #1349 (closed)

This is one of the MRs/changes required to address the problem outlined here and to enable graceful shutdown of registry which is part of #1349 (closed) (namely the implement proper shutdown for for Notifications-related goroutines).

I tried to be as much backwards-compatible as possible and to preserve the current behaviour while making the changes, even if it meant slightly more complicated code than it could be. The new config parameter is kind of a compromise between "wait indefinitely" behaviour we have now and eventqueue being interruptible. We do not have reliable delivery of notifications ATM, so timing out after receiving SIGINT and droppping notifications is OK. What is more - k8s issues SIGKILL if registry does not terminate in time after SIGINT so these notifications would be lost anyway.

NOTE: I rely heavily on go channels and goroutines that communicate as this is the idiomatic way in Golang to implement synchronization in an interruptible fashion.

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Edited by Pawel Rozlach

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