Merge remote-tracking branch 'stefanha/net' into staging

# By Dmitry Fleytman (5) and others
# Via Stefan Hajnoczi
* stefanha/net:
  net: increase buffer size to accommodate Jumbo frame pkts
  VMXNET3 device implementation
  Packet abstraction for VMWARE network devices
  Common definitions for VMWARE devices
  net: iovec checksum calculator
  Checksum-related utility functions
  net: use socket_set_nodelay() for -netdev socket