submodule: move get_default_remote_submodule()
A future refactor got get_default_remote_submodule() is going to depend on
resolve_relative_url(). That function depends on get_default_remote().
Move get_default_remote_submodule() after resolve_relative_url() first
to make the additional functionality easier to review.
Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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