Add Virtualbox cleanup to error handling.

Jenkinsfile

@@ -75,15 +75,19 @@ def performBuild(String project){
   }
 
   catch (err) {
-    handleError("BUILD ERROR: There was a problem with ${project} Appliance. ${env.JOB_NAME} ${env.BUILD_NUMBER} (<${env.BUILD_URL} |Open>) \n\n ${err}")
+    handleError("BUILD ERROR: There was a problem with ${project} Appliance. ${env.JOB_NAME} ${env.BUILD_NUMBER} (<${env.BUILD_URL} |Open>) \n\n ${err}", "${project}-appliance-centos7-xfs")
   }
 }
 
-def handleError(String message){
+def handleError(String message, String appliance_name){
   echo "${message}"
   currentBuild.setResult("FAILED")
   slackSend color: 'danger', message: "${message}"
   //step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: 'chris.bynum@levvel.io', sendToIndividuals: true])
 
+  sh "VBoxManage controlvm ${appliance_name} poweroff"
+
+  sh "VboxManage unregistervm ${appliance_name} --delete"
+
   sh 'exit 1'
 }