Change `--metadata-file` parsing...

...so that, when the input format is not markdown or a markdown
variant, pandoc's markdown is used.  When the input format is
a markdown variant, the same format is used.  Reason for the change:
it doesn't make sense to run the markdown parser with a set of
extensions designed for a non-markdown format, and this dramatically
limits what people can do in metadata files.

Refines #6832.  Closes #7926.

Perhaps this can be reconsidered if we come up with a way
of specifying an arbitrary format for the metadata file (#5914).

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