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/vars/installVoltctl.groovy b/vars/installVoltctl.groovy
index db5c7f9..efeed49 100644
--- a/vars/installVoltctl.groovy
+++ b/vars/installVoltctl.groovy
@@ -24,7 +24,7 @@
     // for release so hilight non-frozen until we know for sure.
     def released=[
 	// https://github.com/opencord/voltctl/releases/tag/v1.8.1
-	// 'voltha-2.11' : '1.8.1',
+	// 'voltha-2.11' : '1.8.4',
 	// https://github.com/opencord/voltctl/releases/tag/v1.7.6
 	'voltha-2.10' : '1.7.6',
 	'voltha-2.9'  : '1.7.4',