nova.config not in the tree is annoying

[Matt Fischer]

From a discussion in the operator conference at the openstack summit....

As operators we sometimes need to look at the default config files to ensure that we're set right, where we've varied from the defaults, and even what's changed in trunk. It looks like that nova.conf was removed from the tree. I know that it's buildable (although that takes an inordinately long time), but this is an extra step that shouldn't need to be taken. I'd love to just browse it on github and be able to diff the file over time. Please consider adding it back, you can even have gerrit generate it or something.