New vm-image size is much smaller than previos

[David Boyd]

The vm-image for 13.0-CURRENT
	
	 FreeBSD-13.0-CURRENT-amd64-20190503-r347033.vmdk

is only 4.0 GB in size.  Previous images were about 31.0 GB.

This smaller image doesn't leave much room to add packages and other
customizations.

Thanks.

David Boyd.