storage_proxy: check that write failure response comes from recognized replica
storage_proxy: check that write failure response comes from recognized replica

Before accounting failure response we need to make sure it comes from a
replica that participates in the request.

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