Update start_server.sh

start_server.sh

@@ -20,7 +20,7 @@ if [[ ! -z "$REPOS" ]]; then
   do
     dir=$(basename "$REPO" .git)
     echo start to clone initial repo $REPO into $dir
-    git clone --progress $REPO $dir
+    git clone --recurse-submodules -j8 --progress $REPO $dir
     cd $dir
     [[ -z $(git config user.name) ]] && git config --global user.name "$(git log -1 --pretty=format:'%an')"
     [[ -z $(git config user.email) ]] && git config --global user.email "$(git log -1 --pretty=format:'%ae')"