Add back test suite hack to enable retry if destination is not found

[stuartwdouglas]

This prevents intermittent failures in the test suite due to async discovery

[dmlloyd]

Note for the future: this is required because nothing blocks the client from proceeding before discovery information is received on an already-established connection. When we have active discovery working, and no longer rely on the existing passive discovery, this hack can be removed again, for good.