poky.yaml: introduce DISTRO_LATEST_TAG

Introduce the DISTRO_LATEST_TAG macro, which should always point to the
latest existing tag in the documentation, unlike DISTRO which may point
to A.B.999 to represent the tip of a branch.

This variable is needed to fix dead links in the documentation that
currently use the DISTRO macro.

Also, make DISTRO_REL_TAG use the DISTRO macro directly, to avoid
repetition, and add a DISTRO_REL_LATEST_TAG macro that has the same role
as DISTRO_LATEST_TAG but with "yocto-" prepended to it.

In set_versions.py, run the "git describe --abbrev=0 --tags
--match='yocto-*'" command to get the latest existing tag on the
currently checked out commit. Fallback to ourversion in case we didn't
find any.

(From yocto-docs rev: a85b0e500c94921f77fa7b7dbb877e4945f96d1e)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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