Merge remote-tracking branch 'remotes/afaerber/tags/qom-devices-for-peter' into staging

QOM infrastructure fixes and device conversions

* QOM API error handling fixes
* Performance improvements for device GPIO property creation
* Remaining conversion of QEMUMachine to QOM

# gpg: Signature made Sat 19 Sep 2015 15:40:44 BST using RSA key ID 3E7E013F
# gpg: Good signature from "Andreas Färber <afaerber@suse.de>"
# gpg:                 aka "Andreas Färber <afaerber@suse.com>"

* remotes/afaerber/tags/qom-devices-for-peter: (21 commits)
  machine: Eliminate QEMUMachine and qemu_register_machine()
  Revert use of DEFINE_MACHINE() for registrations of multiple machines
  Use DEFINE_MACHINE() to register all machines
  mac_world: Break long line
  machine: DEFINE_MACHINE() macro
  exynos4: Declare each QEMUMachine as a separate variable
  exynos4: Use MachineClass instead of exynos4_machines array
  exynos4: Use EXYNOS4210_NCPUS instead of max_cpus on error message
  machine: Set MachineClass::name automatically
  machine: Ensure all TYPE_MACHINE subclasses have the right suffix
  mac99: Use MACHINE_TYPE_NAME to encode class name
  s390: Rename s390-ccw-virtio-2.4 class name to use MACHINE_TYPE_NAME
  s390-virtio: Rename machine class name to use MACHINE_TYPE_NAME
  pseries: Rename machine class names to use MACHINE_TYPE_NAME
  arm: Rename virt machine class to use MACHINE_TYPE_NAME
  vexpress: Rename machine classes to use MACHINE_TYPE_NAME
  vexpress: Don't set name on abstract class
  machine: MACHINE_TYPE_NAME macro
  qdev: Do not use slow [*] expansion for GPIO creation
  qom: Fix invalid error check in property_get_str()
  ...

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