gossip: Ignore the node which is decommissioned in gossip round
gossip: Ignore the node which is decommissioned in gossip round

If the node is decommissioned, there is no point to try to contact it
again in the gossip round.

avikivity/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,raphaelsc/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,raphaelsc/scylla,avikivity/scylla,duarten/scylla