The "libvirt supports:" section on the main page of libvirt.org
contains a list of hypervisors with links that point to the sites of
the underlying virt technologies.  The entry for KVM points to
http://www.linux-kvm.org/, for example.  People coming to libvirt.org
for the first time are likely to know about those sites, and they're
probably interested in how libvirt manages those technologies.  This
patch points those links to the libvirt driver pages instead.  It also
consolidates KVM and QEMU as there is only one libvirt driver page for
them.  Finally, it adds a line about networking support.

v2: incorporate Eric's feedback adding project links to driver pages.

website: Add project links to KVM/QEMU driver page
website: Add project links to Xen driver page
website: Add project links to LXC driver page
website: Add project links to OpenVZ driver page
website: Add project links to UML driver page
website: Add project links to Virtualbox driver page
website: Add project links to ESX driver page
website: Add project links to VMware driver page