Consider using a larger digital storage dpdk interface for statistics

[echoechoin]

Currently, DPDK stats are stored using 16-digit numbers.
For a 10G network card with full speed, the value of rx_good_bytes will exceed the 16-digit limit in just 10 days:

9999999999999999 / (1024 * 1024 * 1024 * 10) / (24 * 60 * 60) ≈ 10.7791964655

Causing the statistics to be undercounted by a factor of 10.

src/plugins/dpdk/device/format.c:

xs = format(xs, "\n%U%-38s%16Lu",
    format_white_space, indent + 4,
    xstat_names[i].name,
    xstat->value);

Which modification is better: changing the code of the format function or increasing the value 16?