The system-wide boot configuration file name. This object and the
juniSystemBootConfigControl object set to file(0) or fileOnce(1) must be
specified together in the same set request PDU. If
juniSystemBootConfigControl is file(0), only file names with extension
'.cnf' are allowed. If juniSystemBootConfigControl is fileOnce(1), only
file names with extensions '.cnf' or '.scr' are allowed. On a set
operation, if the extension is not appropriate or there is no file found
with the name specified, then an error is returned. If
juniSystemBootConfigControl is not set to file(0) or fileOnce(1) then a
get operation for this object will return a zero-length string.