next vimage commit.. a comment

[Julian Elischer]

Some have suggested that we change the VNET_ITERLOOP_BEGIN() / 
VNET_ITERLOOP_END()  code,
and thinking about this I suggest that we go straight for the
final solution of:

change:
	code
	code
	code

to:

	FOREACH_VNET(VINET, vnet_inet) {
		code
		code
		code
	}

straight away. and get it over and done with...

anyone have thoughts?