* test(persistent_session_SUITE): remove redundant sleep and trap_exits
* test(persistent_session_SUITE): fix race for started snabbkaffe
Sometimes snabbkaffe was not started when publishing from a different
process. Wrap the publishing code in a ?check_trace to make sure it is
started, and make sure the publish process is truly down before ending
the trace.
* test(persistent_session_SUITE): fix takeover race
Make sure the previous session is unregistered before trying to
connect again. Sometimes the new session was trying to take over the
session that was shutting down still.
5914b8ad3d