use recursive update

Author: tqchen

Jenkinsfile

@@ -37,12 +37,12 @@ def init_git() {
   deleteDir()
   retry(5) {
     try {
-      // Make sure wait long enough for api.github.com request quota. Important: Don't increase the amount of 
+      // Make sure wait long enough for api.github.com request quota. Important: Don't increase the amount of
       // retries as this will increase the amount of requests and worsen the throttling
       timeout(time: 15, unit: 'MINUTES') {
         checkout scm
-        sh 'git submodule update --init'
-        sh 'git clean -d -f'        
+        sh 'git submodule update --init --recursive'
+        sh 'git clean -d -f'
       }
     } catch (exc) {
       deleteDir()
@@ -60,8 +60,8 @@ def init_git_win() {
       // retries as this will increase the amount of requests and worsen the throttling
       timeout(time: 15, unit: 'MINUTES') {
         checkout scm
-        bat 'git submodule update --init'
-        bat 'git clean -d -f'        
+        bat 'git submodule update --init --recursive'
+        bat 'git clean -d -f'
       }
     } catch (exc) {
       deleteDir()