Dunno why the default is set to "always".  IMHO it should be "auto",
i.e. only colorize in case stdout goes to a terminal.  Cluttering
logfiles and confusing compiler message parsers with terminal control
sequences is not nice ...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>