Botond Dénes afc9f0e177 querier_cache: check that the query wasn't evicted during registering ...

The reader concurrency semaphore can evict the querier when it is
registered as an inactive read. Make the `querier_cache` aware of this
so that it doesn't continue to process the inserted querier when this
happens.
Also add a unit test for this.

(cherry picked from commit 5780f2ce7a)

2018-12-18 14:34:33 +02:00

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