Better replica repair

[alexey-milovidov]

For changelog. Remove if this is non-significant change.

Category (leave one):

• Improvement

Short description (up to few sentences):
Allow to repair abandoned replica even if it already has huge number of nodes in its queue.

[alesapin]

Seems OK. Even if we purge our queue and fail clone, we still can do this on the next retry of start up.

[alesapin]

Maybe we can add integration test? Fill one replica queue with trash, and after that test is_lost logic.

[alexey-milovidov]

Fill one replica queue with trash

It can be done only with manual creating of nodes, because by itself, replica is moving log entries to its queue and processes them almost immediately.