[libvirt] [PATCH 2/2] Support for 'hostonly' and 'internal' network in VirtualBox

Hi All, I have added the support for hostonly and internal network as suggested on irc and list and am attaching the patch for same. PATCH 1/2: contains changes in the xml parsing/formatting on libvirt side namely adding a mode attribute to <source> tag in domain/interface xml PATCH 2/2: contains changes in the vbox driver itself. Regards, Pritesh