init: Use `git clone --recurse-submodules`
We are supporting a pattern where projects like RHCOS use
fedora-coreos-config as a git submodule.  Clone submodules by
default to make that work more nicely.
@@ -95,7 +95,7 @@ mkdir -p src
if ! test -e config; then
case "${source}" in
/*) ln -s "${source}/${subdir}" config;;
- *) git clone "${source}" config
+ *) git clone --recurse-submodules "${source}" config
if [ -n "${BRANCH}" ]; then
git -C config checkout "${BRANCH}"
fi
