fixed case of Jenkinsfile

Jenkinsfile

@@ -0,0 +1,17 @@
+#!/usr/bin/env groovy
+
+parallel 'centos7': {
+    node('centos7') {
+        try {
+            checkout scm
+            stage('Build centos7') {
+                sh 'make -f make-linux.mk linux_service_and_intercept SDK_LWIP=1 SDK_IPV4=1'
+            }
+        }
+        catch (err) {
+            currentBuild.result = "FAILURE"
+            slackSend color: '#ff0000', message: "${env.JOB_NAME} broken on centos7 (<${env.BUILD_URL}|Open>)"
+            throw err
+        }
+    }
+}