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

# gpg: Signature made Wed 06 Apr 2016 03:21:19 BST using RSA key ID 398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@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: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* remotes/jasowang/tags/net-pull-request:
  filter-buffer: fix segfault when starting qemu with status=off property
  rtl8139: using CP_TX_OWN for ownership transferring during tx
  net: fix OptsVisitor memory leak
  net: Allocating Large sized arrays to heap
  util: Improved qemu_hexmap() to include an ascii dump of the buffer

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