[Development] Expiring old change reviews

[Thiago Macieira]

I've just counted: I have 203 pending reviews for me. At least half of them 
haven't been updated in six months. Some of them are for the old master and 
api_changes branches and will never, ever be accepted unless resubmitted.

Last we discussed this, we were waiting for Gerrit to be updated. It has now.

Can we please expire old stuff?
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center