Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream-qgraph' into staging

qgraph project from GSoC 2018

# gpg: Signature made Thu 07 Mar 2019 16:29:17 GMT
# gpg:                using RSA key BFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream-qgraph: (57 commits)
  qos-test: megasas test node
  qos-test: e1000 test node
  qos-test: eepro100 test node
  qos-test: es1370 test node
  qos-test: vmxnet3 test node
  qos-test: usb-hcd-ohci test node
  qos-test: spapr-phb test node
  qos-test: pcnet test node
  qos-test: nvme test node
  qos-test: ne2k_pci test node
  qos-test: ipoctal232 test node
  qos-test: tpci200 test node
  qos-test: ac97 test node
  tests: move virtio entirely to qos-test
  tests/libqos: remove pre-qgraph QVirtioPCIDevice API
  qos-test: virtio-scsi test node
  tests/libqos: virtio-scsi driver and interface nodes
  qos-test: vhost-user test node
  vhost-user-test: always use 256 MiB of guest memory
  tests/libqos: support multiqueue for virtio-net
  ...

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

diff --cc configure
Simple merge