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b757e1bc87
This commit creates a new probe_and_replicate.txt interactive test. The test creates a complete Raft log configuration and demonstrates how a leader probes and replicates to each of its followers. The log configuration constructed is identical to the one present in Figure 7 of the raft paper (https://raft.github.io/raft.pdf), which looks like: ``` 1 2 3 4 5 6 7 8 9 10 11 12 n1: [1][1][1][4][4][5][5][6][6][6] n2: [1][1][1][4][4][5][5][6][6] n3: [1][1][1][4] n4: [1][1][1][4][4][5][5][6][6][6][6] n5: [1][1][1][4][4][5][5][6][7][7][7][7] n6: [1][1][1][4][4][4][4] n7: [1][1][1][2][2][2][3][3][3][3][3] ``` Once in this state, we then elect node 1 as the leader and stabilize the entire raft group. This demonstrates how a newly elected leader probes for matching indexes, overwrites conflicting entries, and catches up all followers. This will be useful to demonstrate the impact of more efficient probing behavior.