release: Add a helper script for common tools

Add a helper script that populates variables used to invoke several tools.
This is also the first step towards cleaning up several inconsistencies
relat

release: Add a helper script for common tools

Add a helper script that populates variables used to invoke several tools.
This is also the first step towards cleaning up several inconsistencies
related to tool invocation in various release scripts (e.g. ${MAKEFS} vs makefs).

Sponsored by: Klara, Inc.
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D51038
Reviewed by: emaste, des

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