Introducing variable for node name

Change-Id: I6fc2ad201684ed3e15ad23eb330ae53df4b896a0
diff --git a/Jenkinsfile b/Jenkinsfile
index 8e5b9f7..ad618ae 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -9,7 +9,7 @@
 }
 
 timeout (time: 240) {
-    node ('${devNodeJenkinsName}') {
+    node ("${devNodeJenkinsName}") {
        stage 'Checkout cord repo'
        checkout changelog: false, poll: false, scm: [$class: 'RepoScm', currentBranch: true, manifestBranch: params.branch, manifestRepositoryUrl: 'https://gerrit.opencord.org/manifest', quiet: true]