Instead of forging a status based on stderr log presence, which is
causing false-negatives when a startup script prints to stderr for no
good reason.

Which make it easier to communicate using the sid with collector users.
Also simplifies code on the collector to identify the logs of a session.

And add the argv to the wrap-up line.

Unclutter the 'action' column.
And fix the line coalescing when rid, action and status are unchanged.

Take care of the subset part in the log entry name, as in:
container:front#nginx