The pkg stanza has an option called `allow_untrusted`, which is
supposed to cause `/usr/sbin/installer` to be called with the
`-allowUntrusted` switch.
PR #3141 seems to have renamed the `pkg_install_opts` field to
`options`. At the same time, it introduces an `options` parameter for
the `run_installer` method, which shadows the `options` getter
method, causing the `allow_untrusted` option to be silently ignored.
The issue affects just the `pkg` stanza because `Hbc::Artifact::Pkg`
is the only artifact class that has an `options` method.
This commit removes the shadowing by renaming the field to
`stanza_options`; in one case, it uses `_options` for a parameter
name (instead of the more canonical `_`) for the sake of clarity.
fbd526ffe6