http://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=v8.27-101-gf5d7c0842
"Given runcon is not really a sandbox command, the advice is to use
`runcon ... setsid ...` to avoid this particular issue.
(From OE-Core rev: 2d273b5aed4a5bd509ec9c68a6f451c17ec17d0c)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>