Merge remote-tracking branch 'remotes/ehabkost/tags/numa-pull-request' into staging

NUMA documentation update

# gpg: Signature made Fri 03 Mar 2017 13:11:25 GMT
# gpg:                using RSA key 0x2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/numa-pull-request:
  qemu-options: Rewrite -numa documentation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>