midx: teach "git multi-pack-index repack" honor "git repack" configurations

When the "repack" subcommand of "git multi-pack-index" command
creates new packfile(s), it does not call the "git repack"
command but instead directly calls the "git pack-objects"
command, and the configuration variables meant for the "git
repack" command, like "repack.usedaeltabaseoffset", are ignored.

Check the configuration variables used by "git repack" ourselves
in "git multi-index-pack" and pass the corresponding options to
underlying "git pack-objects".

Note that `repack.writeBitmaps` configuration is ignored, as the
pack bitmap facility is useful only with a single packfile.

Signed-off-by: Son Luong Ngoc <sluongng@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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