(Re-)add RPKI VRF support

[urscale]

After #5015 introduced the option of configuring RPKI in a VRF context (and FRR 7.5 release notes proudly mentioning rpki VRF support), those changes got reverted in #6740 due to rtlib lacking the required support (rtrlib/rtrlib#252).

With rtlib 0.8.0 now coming with the necessary prerequisites, is there any chance we could see RPKI VRF support brought back to life?

Unfortunately, attempting to revert-the-revert from #6740 leaves me with too many merge conflicts in order to provide a clean PR, so it would be very much appreciated if maybe @pguibert6WIND or someone else could have another look..?

[pguibert6WIND]

Thanks @urscale ,
rpki per vrf support can be re-backported, but there is an extra-dependency:

https://github.com/rtrlib/rtrlib/releases/tag/v0.8.0 is needed.
so if this library is not available on current distributions, this will not be possible.

[ton31337]

@pguibert6WIND do you want to re-add vrf support or no time for that? In terms of librtr, we have 0.8.0 in our deb/rpm repos, that's not an issue anymore.

[pguibert6WIND]

yes, I will re-add it when some bandwidth is available.

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[pguibert6WIND]

task done

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