Glen Barber 0bc9be5e74 Avoid using env(1) to set values passed to mk-vmimage.sh,
and instead pass the values as arguments to the script,
making it easier to run this by hand, without 'make release'.

Add usage_vm_base() and usage_vm_image() usage helpers.

Sponsored by:	The FreeBSD Foundation
2014-10-01 19:13:42 +00:00
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