app-emulation/containerd: add containerd-runc-shim-v*

Add new binaries containerd-runc-shim-v[12] to the torcx tarballs for
docker and containerd. The binaries are necessary for kubelet to
communicate via custom CRI endpoints.

The addition will cause usage of the /usr partition to grow by ~5M.

```
$ ls -l /run/torcx/unpack/docker/bin
-rwxr-xr-x. 1 root root  6742592 Sep 30 13:22 containerd-shim
-rwxr-xr-x. 1 root root  9095176 Sep 30 13:22 containerd-shim-runc-v1
-rwxr-xr-x. 1 root root  9111752 Sep 30 13:22 containerd-shim-runc-v2

$ ls -l /usr/share/torcx/store/docker\:19.03.torcx.tgz
-rw-r--r--. 1 root root 89809888 Sep 30 14:16 /usr/share/torcx/store/docker:19.03.torcx.tgz

$ df /usr
Filesystem      1K-blocks   Used Available Use% Mounted on
/dev/mapper/usr   1007760 916024     39720  96% /usr
```

Note, we do not touch other torcx profiles like docker 1.12 or 17.03,
to keep the image size as small as possible.

sdk_container/src/third_party/coreos-overlay/app-emulation/containerd/containerd-9999.ebuild

@@ -58,7 +58,7 @@ src_compile() {
 }
 
 src_install() {
-	dobin bin/containerd{-shim,-stress,} bin/ctr
+	dobin bin/containerd{-shim,-shim-runc-v*,-stress,} bin/ctr
 	systemd_newunit "${FILESDIR}/${PN}-1.0.0.service" "${PN}.service"
 	insinto /usr/share/containerd
 	doins "${FILESDIR}/config.toml"