v2v: 'du -b' doesn't show real (sparse) size.

This caused the actual size to be wrong (in OVF output).
Use --block-size=1 instead.
v2v: Print the difference between our disk size estimate and actual size.
mllib: Coloured messages, errors, warnings.

Uses ANSI terminal codes to colour the output.
appliance: Use dhclient or dhcpcd instead of hard-coding IP address of appliance.

qemu in SLIRP mode offers DHCP services to the appliance.  We don't
use them, but use a fixed IP address intead.  This changes the
appliance to get its IP address using DHCP.

Note: This is only used when the network is enabled.  dhclient is
somewhat slower, but the penalty (a few seconds) is only paid for
network users.

On SuSE or other distros, dhcpcd could be used if available.
launch: libvirt: Use qemu-bridge-helper to implement a full network (RHBZ#1148012).

When using the libvirt backend, don't use the SLIRP.  Use
qemu-bridge-helper via libvirt to give us a full network connection.

One consequence of this is that 'ping' works in
'virt-builder --run-command'.

A less useful consequence is that the host firewall will prevent
connections on non-standard ports to the host.  So you can't (eg)
connect to a rsync daemon on the host listening on an arbitrary port,
which worked before.

The default bridge is 'virbr0', but you can override this by setting
LIBGUESTFS_BACKEND_SETTINGS=network_bridge=<some_bridge>

Note: this does not fix virt-rescue (since it overrides the default
backend and uses 'direct' for various reasons).
appliance: Change example ping lines to ping 8.8.8.8.

This are commented out (still) so this change does nothing.
tests: rsync: Skip this test when the backend is libvirt.

It would work, except if you have a host firewall which will block
inbound connections on virbr0 to non-standard ports.
tests: Disable UML tests in 'check-release'.

This effectively demotes UML to unsupported status.  This has happened
because UML has regressed quite a lot upstream.  There are multiple
grave bugs revealed by running the test suite and I don't have the
inclination to fix them.
Version 1.27.57.