refs: add expand_ref()
This is basically dwim_ref() without @{} support. To be used on the server side where we want to expand abbreviated to full ref names and nothing else. The first user is "git clone/fetch --shallow-exclude". Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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