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5d8752602b
Introduce partition update command consisting of nodes still seeing
each other. Nodes not included are disconnected from everything else.
If the previous leader is not part of the new partition, the first node
specified in the partition will become leader.
For other nodes to accept a new leader it has to have a committed log.
For example, if the desired leader is being re-connected and it missed
entries other nodes saw it will not win the election. Example A B C:
partition{A,C},entries{2},partition{B,C}
In this case node C won't accept B as a new leader as it's missing 2
entries.
Signed-off-by: Alejo Sanchez <alejo.sanchez@scylladb.com>