Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

X86 queue, 2015-04-27 (v2)

# gpg: Signature made Mon Apr 27 19:42:39 2015 BST using RSA key ID 984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-pull-request:
  target-i386: Remove AMD feature flag aliases from CPU model table
  target-i386: X86CPU::xlevel2 QOM property
  target-i386: Make "level" and "xlevel" properties static
  qemu-config: Accept empty option values
  MAINTAINERS: Change status of X86 to Maintained
  MAINTAINERS: Add myself to X86

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