make "vital" a replaceable, which defaults to "false" and only set it for
the main clib, utilities and runtime packages, not their sub-packages
PR: 254174
Differential Revision: https://reviews.freebsd.org/D29224
One of the major pain points with how this was implemented
is the requirement of in-tree, hard-coded <name>.ucl, as
well as <name>-<suffix>.ucl where <suffix> can be lib32,
profile, development, debug, or any combination of the four.
This created significant overhead when adding new packages
and any of the files in any of the combinations were missing.
Instead of test(1)-ing if the <packagename>.ucl file exists,
hand off to a script to figure out what the final ucl file
name should be before invoking pkg(8).
The default behavior is 'template.ucl' is used as a fallback.
This affects only the userland packages, as the kernel code
is already smart enough to handle these variations.
Sponsored by: The FreeBSD Foundation
