* src/vbox/vbox_tmpl.c: a bit of cleanup

* src/vbox/vbox_tmpl.c: merged vboxNetworkUndefine() and
  vboxNetworkDestroy() and added code to handle multiple hostonly
  interfaces.

* src/vbox/vbox_tmpl.c: merged vboxNetworkCreateXML() and
  vboxNetworkDefineXML() and added code to handle multiple hostonly
  interfaces.

* src/vbox/vbox_tmpl.c: add setting of video and acceleration in
  VBox driver, and the ability to save this back for serialization

* src/vbox/vbox_tmpl.c: adds support for getting/setting number of cpus

* src/vbox/vbox_driver.c: remove some old 2.5 switches and plug the
  3.0 driver
* src/vbox/vbox_V3_0.c src/vbox/vbox_CAPI_v3_0.h: the driver for
  VirtualBox 3.0
* src/vbox/vbox_tmpl.c: handle the new driver and add event support
* src/Makefile.am: plug in the new module

When we hot-plug a disk device into a qemu guest, we need to retain its
PCI address so that it can be removed again later. Currently, we do
retain the slot number, but not across libvirtd restarts.

Add <state devaddr="xxxx:xx:xx"/> to the disk device XML config when the
VIR_DOMAIN_XML_INTERNAL_STATUS flag is used. We still don't parse the
domain and bus number, but the format allows us to do that in future.

* src/domain_conf.h: replace slotnum with pci_addr struct, add helper
  for testing whether the address is valid

* src/domain_conf.c: handle formatting and parsing the address

* src/qemu_driver.c: store the parsed slot number as a full PCI address,
  and use this address with the pci_del monitor command

* src/vbox/vbox_tmpl.c: we're debug printing slotnum here even though
  it can never be set, just delete it

* src/vbox/vbox_tmpl.c: reconnecting to vbox:///session was failing

* src/vbox/vbox_driver.c src/vbox/vbox_tmpl.c: last patch for
  hostonly networks support in vbox driver, patch by Pritesh Kothari
daniel

  patches by Pritesh Kothari
daniel

* src/vbox/vbox_tmpl.c: "Host only" and "Internal" network support
  for vbox, patch by Pritesh Kothari
daniel

found so other hypervisors can be probed. Patch by Pritesh Kothari.

* src/vbox/vbox_driver.c src/vbox/vbox_tmpl.c: changes in
  VirtualBox driver version detection and move informations
  from a global variable into a driver structure, patch by Pritesh
  Kothari.
Daniel

* configure.in include/libvirt/virterror.h src/Makefile.am
  src/domain_conf.[ch] src/driver.h src/virterror.c src/vbox/README
  src/vbox/vbox_CAPI_v2_2.h src/vbox/vbox_V2_2.c
  src/vbox/vbox_XPCOMCGlue.[ch] src/vbox/vbox_driver.[ch]
  src/vbox/vbox_tmpl.c: integration of the VirtualBox support
  patches by Pritesh Kothari
Daniel