(Requires Audit) PLEX-2473 LogPoller Fix Reorg Handing on Replay (Part 1)

[dhaidashenko]

TestCase that were previously failing:

1. LogPoller processes blocks to block 11
2. Reorg replaces block 11 with a new block (some additional blocks may be added on top of it)
3. Replay is initiated from block below 11.

Expected behaviour:

1. LogPoller must replace reorged block 11 with a new data.
2. DB must not contain at any point logs from both old and new block 11.
3. Finality Violation must not occur, since chain did not violate finality depth.

Supports: #356