HTTP is not used for RPKI information, the RTR protocol is used, which works on
top of plain TCP. Although some implementations can use TLS, VyOS (and FRR) do
not support it, and use either plain TCP or SSH.
(cherry picked from commit edbf8846059a9f3e2d5a6bdf8227f97f5d79da4f)
I took the remark that rpki.readthedocs.io is somewhat NLnet Labs tools-centric to
heart and made it completely neutral. It no longer has any vendor-specific
documentation at all.
