chore(*): bump CoreOS to 490.0.0

See https://coreos.com/releases/#490.0.0

Notably, the 3.17 kernel is recommended for Ceph, as it supposedly has fixes for Ceph FS stability: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-October/043749.html
Thanks for reordering these, makes it much easier to verify against https://coreos.com/docs/running-coreos/cloud-providers/ec2/.