lxc-attach: setup ts->stdoutfd
Otherwise we cannot do things like:
- lxc-attach -n a runlevel </dev/null
- lxc-attach -n a runlevel </dev/null 2>/dev/null
- lxc-attach -n a runlevel </dev/null 2>/dev/null | cat
Signed-off-by:
Christian Brauner <christian.brauner@mailbox.org>
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