Tests for hivemind freezed on 11 000 000 block

Dariusz Kędzierskirequested to merge
dk-hivemind-11000000 into master
  • Added test for hivemind freezed on 11000000 blocks (after HF17),
  • Cleanup 5000000 directory: removed not needed files,

Tests runned on hivemind (master) branch, all green.

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