stage2: Ensure stdin doesn't get overwritten with stdout
stage2: Ensure stdin doesn't get overwritten with stdout

Fixes an issue with the stage2 launcher, where it was setting the
argument for stdin to point to stdout instead of configuring stdout.

This was not noticed thus far because existing usage was with
stdin/out/err pointing to the same fd.

apcera/kurma,apcera/kurma,apcera/kurma,apcera/kurma,apcera/kurma