shim: Configure standards outputs/input before spawning the shim
shim: Configure standards outputs/input before spawning the shim

We want the shim to inherit standards outputs/input from the runtime
but this was not done by default. Indeed, exec.Command() assign by
default the standards out/in to /dev/null.

That's why this patch explicitely assign stdin, stdout and stderr
from the runtime process to the shim process.

Signed-off-by: Sebastien Boeuf <90b401417360b1924ef3f520ddee932686110f85@intel.com>

clearcontainers/runtime,devimc/runtime,devimc/runtime,chavafg/runtime,gorozco1/runtime,chavafg/runtime,clearcontainers/runtime,gorozco1/runtime