Re: [Libguestfs] [PATCH 3/8] ESX: Import guests from VMware's ESX server

This change adds the ability to import a guest and its storage from VMware's ESX server using the LibVirt connection. An example command line: virt-v2v -ic 'esx://yellow.marston/?no_verify=1' -op transfer RHEL5-64 This will import the guest RHEL5-64 from esx server yellow.marston, copying its storage to a local pool called transfer. Sys::VirtV2V::Connection is refactored to be a superclass. Subclasses are now created explicitly by virt-v2v.pl rather than using a generic instantiate mechanism. Sys::VirtV2V::Connection::LibVirt knows explicitly about ESX, and will use the new Sys::VirtV2V::Transfer::ESX to fetch its storage. virt-v2v.pl is updated to reflect the other changes.