JJB cleanups for VOLTHA.

Misc/
  o yaml lint clenaups
  o Remove prototype voltha-2.{9,10,11} job placeholders.
  o Replace mainatiner email address (Matteo) with build system group.

Change-Id: I37e1175f56042632753b75c849dbaf07f74bd284
diff --git a/jjb/pipeline/xos-core.groovy b/jjb/pipeline/xos-core.groovy
index 8962545..21ca1b4 100644
--- a/jjb/pipeline/xos-core.groovy
+++ b/jjb/pipeline/xos-core.groovy
@@ -202,7 +202,7 @@
             reportFileName: 'RobotLogs/report*.html',
             unstableThreshold: 0]);
          archiveArtifacts artifacts: '*.log'
-         step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: "kailash@opennetworking.org, teo@opennetworking.org", sendToIndividuals: false])
+         step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: "kailash@opennetworking.org, onf-bat-admin@opennetworking.org", sendToIndividuals: false])
 
     }
   }