Nodetool status reports 'UN' status for an initializing node during replace-node operation

[yarongilor]

During the nodetool operation of replace node, the replacing node is reported with a status of "UN" when it is still not really normal but rather in initializing state. it should report a different status like "UJ" for example.

see example in this comment: https://github.com/scylladb/scylla/issues/9629#issuecomment-998926636

The original scylla issues with details are: https://github.com/scylladb/scylla/issues/9629#issuecomment-1046703526 and: https://github.com/scylladb/scylla/issues/1793

[roydahan]

@slivne who should look at it?

[roydahan]

@asias / @bhalevy ?

[bhalevy]

What's the direction for the fix? Add a "R" status for replacing?

[slivne]

@asias / this maybe related to repair-based-node-operations as we moved replace to use repair=-based-node-operations