nodetool decommission node 127.0.0.2, on node 127.0.0.1, I saw:
DEBUG [shard 0] gossip - failure_detector: Forcing conviction of 127.0.0.1
TRACE [shard 0] gossip - convict ep=127.0.0.1, phi=8, is_alive=1, is_dead_state=0
TRACE [shard 0] gossip - marking as down 127.0.0.1
INFO [shard 0] gossip - inet_address 127.0.0.1 is now DOWN
DEBUG [shard 0] storage_service - on_dead endpoint=127.0.0.1
This is wrong since the argument for send_gossip_shutdown should be the
node being shutdown instead of the live node.
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