Change liveliness tokens logs from warn to debug level #22
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As agreed here change the log levels of warnings about "out-of-order" unregistration of liveliness tokens from
warn
todebug
.The reason is that in case a remote Node is disconnected or if it shuts down abruptly (calling
rmw_shutdown
and thus closing the Zenoh session before deleting its pubs/subs/services) Zenoh will locally deliver the events of liveliness tokens unregistrations in an arbitrary order. Thus it's likely that the unregistration of Node will be notified before the unregistration of its pubs/subs/services.