[collectd] Wireshark dissector for collectd network plugin

[Bruno Prémont]

> - I'm not sure the double decoding is right... I have just used the
>   ieee double support from wireshark - this might not work as expected
>   on some architectures!

This updated patch uses collectd's code stubs to read double (gauge)
values and produces expected results.
This has been tested on x86.

Bruno
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