This adds an additional directive to the dnsmasq configuration file that notifies clients via dhcp about the link's MTU. Guests can then choose adjust their link accordingly. Signed-off-by: Casey Callendrello <cdc@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Ján Tomko <jtomko@redhat.com>