raft: etcd_test: test_transfer_non_member
raft: etcd_test: test_transfer_non_member

Test that a node outside configuration, that receives `timeout_now`
message, doesn't disrupt operation of the rest of the cluster.

That is, `timeout_now` has no effect and the outsider stays in
the follower state without promoting to the candidate.

Tests: unit(dev, debug)

Signed-off-by: Pavel Solodovnikov <2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla