Run a single instance of the REST adapter verticle only.
Run a single instance of the REST adapter verticle only.

This prevents problems when connecting to a Hono server that itself runs
less instances of the Hono server verticle than the REST adapter
verticle.
kinbod/hono,dejanb/hono,dejanb/hono,kinbod/hono,dejanb/hono,kinbod/hono