`git meta fetch` and `git meta push` resolve submodule's URL using "origin" rather than the given URL

[jhedwardyang]

git meta remote remove origin
git meta fetch $URL # OR git meta push $URL

Expected:

• Resolves submodule's relpath (../../foo/bar) to $URL

Actual:

• Fails since it needs "origin"

[shijinglu]

sry, mis-click