Remove Jenkins masters from grafana dashboard

We no longer get stats from jenkins, so we can remove this panel.

Change-Id: Ic118d9d1c47d9930e1fb58cd58123d1e500dfe8e
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

grafana/nodepool.yaml

@@ -50,30 +50,6 @@ dashboard:
               - target: sumSeries(stats.gauges.nodepool.provider.*.nodes.delete)
           type: singlestat
           valueName: current
-    - title: Jenkins Masters
-      showTitle: true
-      height: 320px
-      panels:
-        - title: Building Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.target.*.nodes.building, 4)
-          type: graph
-        - title: Ready Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.target.*.nodes.ready, 4)
-          type: graph
-        - title: Used Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.target.*.nodes.used, 4)
-          type: graph
-        - title: Deleting Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.target.*.nodes.delete, 4)
-          type: graph
     - title: Zuul Launchers
       showTitle: true
       height: 320px