build-unit-test-docker: update ubuntu to kinetic
build-unit-test-docker: update ubuntu to kinetic

The clang-15 packages are only going to be available in kinetic
or later.  Switch the docker base to that distro version.  That
version already has the autoconf-archive required for C++20 and
it has gcc-12 by default, so we can remove (or comment for the time
being) some workarounds we had.

Signed-off-by: Patrick Williams <cbb7353e6d953ef360baf960c122346276c6e320@stwcx.xyz>
Change-Id: I6eb7fd7218027941af949522e043ed5dd6ea4f9b

openbmc/openbmc-build-scripts,openbmc/openbmc-build-scripts