dev-python/distro-oem: Add new package

See README.md for details on why we add this package instead of
importing dev-python/distro from gentoo.

sdk_container/src/third_party/coreos-overlay/dev-python/distro-oem/Manifest

@@ -0,0 +1 @@
+DIST distro-1.6.0.tar.gz 69377 BLAKE2B 69119c3acfc12327a55e8b16f4e183fe1b039e965a5432081d83c6e5d0f6367846c403eb34764f2436beec173d3ceaa5265e0e1e7d786d1008e84772426ef049 SHA512 1682a52e617ba440eb0fac28ed653dd3bbc53012e3dc81099d792f088d399c1a6aba62d638e7b50aad88de2cd0935579a0bdd29a9abb5aad9d0c68bd90311268

sdk_container/src/third_party/coreos-overlay/dev-python/distro-oem/README.md

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+This package is a hacked-up way to install a distro module for oem
+packages to use. It's meant to be used by dev-lang/python-oem, thus
+not using any python-specific eclasses and whatnot, to avoid pulling
+python dependency into the production image.

sdk_container/src/third_party/coreos-overlay/dev-python/distro-oem/distro-oem-1.6.0.ebuild

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+# Copyright 2021 Microsoft Corporation
+# Distributed under the terms of GNU General Public License v2
+
+EAPI=7
+
+MY_PN='distro'
+MY_P="${MY_PN}-${PV}"
+
+DESCRIPTION="OS platform information API"
+HOMEPAGE="https://github.com/python-distro/distro"
+SRC_URI="${HOMEPAGE}/releases/download/v${PV}/${MY_P}.tar.gz"
+
+LICENSE="Apache-2.0"
+KEYWORDS="amd64 arm64"
+
+SLOT="0"
+RDEPEND="dev-lang/python-oem"
+
+S="${WORKDIR}/${MY_P}"
+
+src_compile() {
+    # nothing to do
+    :
+}
+
+src_install() {
+	# When updating python-oem, remember to update the path below.
+	insinto "/usr/share/oem/python/$(get_libdir)/python3.6/site-packages"
+	doins "${S}/distro.py"
+}

sdk_container/src/third_party/coreos-overlay/dev-python/distro-oem/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+</pkgmetadata>