Updated openstack/openstack
Project: openstack/nova  f42b9f873d5d0979cb4aa716d2906ebe270f7353

Add development policies section to devref

We now have a whole bunch of unwritten development policies about what is
allowed and what isn't, it is time to write some of them down.

A subsequent patch will add the first policy.

Change-Id: I91c2eb2b937f38b3b3c5380ac93fa0ce0f5e4156