exec: fix pipes

In a largely anticlimatic solution to the saga of piped input from conmon, we come to this solution.

When we pass the Stdin stream to the exec.Command structure, it's immediately consumed and lost, instead of being consumed through CopyDetachable().

When we don't pass -i in, conmon is not told to create a masterfd_stdin, and won't pass anything to the container.

With both, we can do

echo hi | podman exec -til cat

and get the expected hi

Signed-off-by: Peter Hunt <pehunt@redhat.com>

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