Setting MTU size in dpdk input plugin

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 40.67%. Comparing base (4e5681b) to head (e13ff4e). Report is 24 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #205 +/- ## ========================================== - Coverage 40.90% 40.67% -0.23% ========================================== Files 100 100 Lines 8826 9462 +636 Branches 1312 1394 +82 ========================================== + Hits 3610 3849 +239 - Misses 4446 4798 +352 - Partials 770 815 +45 ``` | [Flag](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/205/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/205/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | `40.67% <ø> (-0.23%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET#carryforward-flags-in-the-pull-request-comment) to find out more.

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