The tests no longer call the writer on a bus without permissions: the controller runs as it serves, the builder and
the indexer write their own keys as their own accounts, and the operator's rotate is the real verb, so a subject the
user list does not grant fails them as it would fail the mesh.
A node away during the switch finds its last declaration on the stream; once every node's have names the
node-engine registered, no node reads one, so the stream and the nodes' consumers on it go, said once, and a raise
leaves them out (ADR 0539 clause 11).
jschoubben