fix tee errors

Do not specify /dev/fd3 directly, use >&3 instead. This change enables
to use stack.sh as an upstart script, and with VERBOSE=False, it will
print the expected messages.

Fixes bug 1230342

Change-Id: I6e3a81fd435e8c46d553bfdee08f8bf42d0f4387
Merge "fix tee errors"