Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging

Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging

# gpg: Signature made Mon May 11 16:25:58 2015 BST using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/net-pull-request:
  rocker: timestamp on the debug logs helps correlate with events in the VM
  MAINTAINERS: add rocker
  rocker: add tests
  rocker: add new rocker switch device
  pci: add network device class 'other' for network switches
  pci: add rocker device ID
  rocker: add register programming guide
  virtio-net: use qemu_mac_strdup_printf
  net: add MAC address string printer

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