value is set to `superproject` the submodule to be cloned computes
its alternates location relative to the superprojects alternate.
-submodule.alternateErrorStrategy
+submodule.alternateErrorStrategy::
Specifies how to treat errors with the alternates for a submodule
as computed via `submodule.alternateLocation`. Possible values are
`ignore`, `info`, `die`. Default is `die`.