osd: support osd_numa_node, osd_numa_auto_affinity, osd_numa_prefer_iface

osd: support osd_numa_node, osd_numa_auto_affinity, osd_numa_prefer_iface

- osd_numa_node manually specifies a numa node.
- osd_numa_prefer_iface makes us prefer IPs in public_network that are
  on the same numa node as the storage
- osd_numa_auto_affinity will set affinity to a numa node when both the
  store and network(s) are on the same numa node.

These options are all flagged as 'startup', although osd_numa_node and
osd_numa_auto_affinity takes effect when the OSD is marked up, so doing
'ceph osd down ...' is sufficient to induce an update.

Signed-off-by: Sage Weil <sage@redhat.com>