builtin-remote: teach show to display remote HEAD
This is in preparation for teaching remote how to set refs/remotes/<remote>/HEAD to match what HEAD is set to at <remote>, but is useful in its own right. Signed-off-by: NJay Soffian <jaysoffian@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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