Fix in Jenkinsfile

Change-Id: I9080d4e89a166996fcbe7db275a724f921888ee4
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/Jenkinsfile b/Jenkinsfile
index 39fc00a..15353c6 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -16,12 +16,12 @@
     }
 }
 
-node {
+node('docker') {
     checkout scm
     devops_checkout()
 
-    ci_helper = load "devops/jenkins/ci-pipelines/ci_stage_2.groovy"
-    ci_helper.ci_pipeline( 'LCM',
+    ci_stage_2 = load "devops/jenkins/ci-pipelines/ci_stage_2.groovy"
+    ci_stage_2.ci_pipeline( 'LCM',
                            params.PROJECT_URL_PREFIX,
                            params.GERRIT_PROJECT,
                            params.GERRIT_BRANCH,