jenkins: cleaned submodule with changed distro version

Signed-off-by: Marc Mattmueller <marc.mattmueller@netmodule.com>

Jenkinsfile

@@ -80,6 +80,11 @@ pipeline {
         }
         sh "rm -rf ${WORKSPACE}/tmp"
       }
+      post {
+        always {
+          cleanup_distro_version()
+        }
+      }
     }
   } // stages
 }
@@ -125,6 +130,11 @@ def change_distro_version(versionString){
   sh(script:"${sedCmd} meta-netmodule-distro/conf/distro/netmodule-linux.conf")
 }
 
+def cleanup_distro_version() {
+  println "cleaning submodule holding distro version..."
+  sh 'cd meta-netmodule-distro && git checkout *'  
+}
+
 
 def build_and_archive() {
     if (params.IMAGE_TYPE == 'sdk') {