Remove the following options (obsoleted by --external):

	--ext-unix-sk
	--veth-pair
	--ext-mount-map
	--enable-external-masters
	--enable-exteral-sharing

travis-ci: success for Add/fix description of --external and --inherit-fd
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>