Fill out kilo priorities as discussed at the summit

List priorities along with owners (and there contact info in the form of
launchpad links) and include a brief blurb on why we picked each
priority.

Based on https://etherpad.openstack.org/p/kilo-nova-priorities

Change-Id: I609f434279d37cd6ea8b983fad0f28a6bdd1df8b
Merge "Fill out kilo priorities as discussed at the summit"