To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_id() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_id() which retrieve
names of statistics specified by ids array.
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
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