[LTP] [PATCH v2 1/5] tst_rtnetlink: Refactor helper function for generic use

[Petr Vorel]

Hi Martin,

...
> -3 rtnetlink API
> +3 Netlink API
>  ---------------
I fixed formatting (this must be shorter: ------------)
and merged the first 3 commits.

Thanks!

Kind regards,
Petr