[IPFIX] IPFIX length fields

Dear all,

Reviewing IANA's IPFIX field list, we noticed that most of the *length 
fields have no semantics.

However, mplsTopLabelPrefixLength has semantics of "identifier", while 
ethernetHeaderLength, ethernetPayloadLength, ethernetTotalLength have 
semantics of "identifier".

We propose that these all be changed to no semantics.

Or better, that all lengths be changed to semantics of "quantity", since 
RFC5102 says,

    3.2.1.  quantity

        A quantity value represents a discrete measured value pertaining to
        the record.  This is distinguished from counters that represent an
        ongoing measured value whose "odometer" reading is captured as part
        of a given record.If no semantic qualifier is given, the
        Information Elements that have an integral data type should behave as
        a quantity.


Feedback?

Thanks,
Paul and Nick

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