git-submodule - Use "get_default_remote" from git-parse-remote
git-submodule - Use "get_default_remote" from git-parse-remote

Resolve_relative_url was using its own code for this function, but
this is duplication with the best result that this continues to work.
Replace with the common function provided by git-parse-remote.

Signed-off-by: Mark Levedahl <8aa130933e77e463a48d5440e4c2ba8a350d0f50@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git