builtin/submodule--helper: factor out method to update a single submodule
authorStefan Beller <sbeller@google.com>
Fri, 3 Aug 2018 22:23:20 +0000 (15:23 -0700)
committerJunio C Hamano <gitster@pobox.com>
Fri, 3 Aug 2018 22:37:12 +0000 (15:37 -0700)
In a later patch we'll find this method handy.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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