Also disable master-2-16-32-{att,dt,tt} jobs that hang on inactive blade hardware

Makefile
makefiles/target/
-----------------
  o Refactor Makefile, move target logic into makefiles/targets/{target-name}.mk
  o Add context specific help -> makefile target: help-{target-name}

Change-Id: Ib00975e56488c7c23ebc01963002be59a7e3c97c
diff --git a/jjb/voltha-scale.yaml b/jjb/voltha-scale.yaml
index 09d8582..e77f8fd 100644
--- a/jjb/voltha-scale.yaml
+++ b/jjb/voltha-scale.yaml
@@ -52,7 +52,7 @@
           name: 'voltha-scale-measurements-master-2-16-32-att-subscribers'
           build-node: 'voltha-scale-1'
           time-trigger: "H H/4 * * *"
-          disable-job: false
+          disable-job: true
           olts: 2
           pons: 16
           onus: 32
@@ -92,7 +92,7 @@
           name: 'voltha-scale-measurements-master-2-16-32-dt-subscribers'
           build-node: 'voltha-scale-1'
           time-trigger: "H H/4 * * *"
-          disable-job: false
+          disable-job: true
           olts: 2
           pons: 16
           onus: 32
@@ -114,7 +114,7 @@
           name: 'voltha-scale-measurements-master-2-16-32-tt-subscribers'
           build-node: 'voltha-scale-1'
           time-trigger: "H H/4 * * *"
-          disable-job: false
+          disable-job: true
           olts: 2
           pons: 16
           onus: 32
@@ -141,6 +141,7 @@
           name: 'voltha-scale-measurements-master-2-16-32-tt-subscribers-maclearner'
           build-node: 'voltha-scale-1'
           time-trigger: "H H/4 * * *"
+          disable-job: true
           olts: 2
           pons: 16
           onus: 32
@@ -159,7 +160,6 @@
            --set onos-classic.image.repository=andreacampanella/voltha-onos --set onos-classic.image.tag=maclearner
            --set bbsim-sadis-server.images.bbsim_sadis_server.tag=master
 
-
       # 4k ONTs jobs
       - 'voltha-scale-measurements':
           name: 'voltha-scale-measurements-master-2-64-32-dt-subscribers'