t0211: demonstrate missing 'def_param' events for certain commands

Some Git commands fail to emit 'def_param' events for interesting
config and environment variable settings.

Add unit tests to demonstrate this.

Most commands are considered "builtin" and are based upon git.c.
These typically do emit 'def_param' events.  Exceptions are some of
the "query" commands, the "run-dashed" mechanism, and alias handling.

Commands built from remote-curl.c (instead of git.c), such as
"git-remote-https", do not emit 'def_param' events.

Likewise, "git-http-fetch" is built http-fetch.c and does not emit
them.

Signed-off-by: Jeff Hostetler <jeffhostetler@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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