jobs/Common: added temporary source update tasks (sub-repositories)

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

jobs/Jenkinsfile_Common

@@ -132,6 +132,9 @@ def gitCheckout(gitUrl, branchTag, repoDir, hasSubmodules) {
     sshagent (credentials: [gitCredentials]) {
       sh(script: "git fetch -ap && git fetch -t")
       sh(script: "git checkout ${branchTag} && git pull --rebase ${updateSubmodulesCmd}")
+
+      sh(label: "Temporary task - updating source revisions (sub-repositories)",
+         script: "./scripts/update-source-revisions.sh")
     }
     if(hasSubmodules) {
       submoduleStatus = sh(script: "git submodule status", returnStdout: true)