Add persistence e2e test.

[0xSasaPrsic]

Persistence issue test where nodes can insert different proposal for the same sequence.
Cluster of 5 nodes: A_0, A_1, A_2, A_3, A_4
Flow map defined for the round 0:
A_0 -> A_0, A_1, A_2, A_3
A_1 -> A_1, A_2, A_3
A_2 -> A_0, A_2
A_3 -> A_0, A_2

In round 0 node proposer A_0 receives enough commit messages from other nodes defined in the flow map and inserts a proposal.
Node A_3 in round 0 gets locked.
Node A_2 after receiving enough commit messages fails to insert proposal locally and unlocks the proposal and triggers round change.
In round 0 nodes A_1 and A_4 do not receive enough messages on time and trigger round change.
At this point: node A_0 has inserted proposal, node A_1 is not locked, node A_2 is not locked (unlocked because insert failed), node A_3 is locked and node A_4 did not receive any message
After moving to round 1 proposer A_1 creates a new proposal which then is propagated through the network
and gets inserted since there is enough commit messages from nodes A_1, A_2 and A_4
which is different from the proposal inserted in round 0.

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