runs until a bus name appears, then exits successfully. This can be used as a
service-activation helper for a bus name that is not directly activatable, but
will be provided automatically (after a while) by the desktop session.
The bus name eventually appeared.
Invocation error (too many or too few arguments, or the bus name given was
not a syntactically valid well-known bus name).
mc-wait-for-name was unable to connect to the session bus.
The name did not appear within a reasonable time.
There are no additional command-line options.
The "reasonable time" to wait is currently hard-coded.