[Linaro-validation] adding a dependency to LAVA post l-d-t

Hey Michael,

I was trying to update our staging instance to use a new component today (lava-celery). I got it working, but I'm not sure if I followed the best practice for doing this. What I did:

added entry to /srv/lava/instances/staging/code/current/buildout.cfg pulled in my local branch of the component to code/current/local ran ./bin/buildout

So what's the proper way to do what I just hacked together?

-andy