pass arguments correctly to template

There are a few reasons to wait on pushing the lxc-create patch:

1. needs to ensure unlocking  in /dev/shm and cleaning up the container
if interrupted.
2. should somehow provide more info about what is going on.  Should we
simply not close stdin/out/err,  or should we give more cleansed info?
Or is blessed silence a virtue?

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>