Merge branch 'sb/submodule-update-reset-fix' into maint

When resetting the working tree files recursively, the working tree of submodules are now also reset to match. * sb/submodule-update-reset-fix: submodule: submodule_move_head omits old argument in forced case unpack-trees: oneway_merge to update submodules t/lib-submodule-update.sh: fix test ignoring ignored files in submodules t/lib-submodule-update.sh: clarify test