Remove zuul-launchers from nodepool dashboard

We no longer have zuul-launchers, lets remove them.

Change-Id: Ic798c99417520849fa66521e6410fe5d52eeb67e
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

grafana/nodepool.yaml

@@ -77,30 +77,6 @@ dashboard:
               - target: sumSeries(stats.gauges.nodepool.provider.*.nodes.failed)
           type: singlestat
           valueName: current
-    - title: Zuul Launchers
-      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.manager.*.nodes.ready, 4)
-          type: graph
-        - title: Used Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.manager.*.nodes.used, 4)
-          type: graph
-        - title: Deleting Nodes
-          span: 3
-          targets:
-            - target: aliasByNode(stats.gauges.nodepool.manager.*.nodes.delete, 4)
-          type: graph
     - title: Nodepool Images
       showTitle: true
       height: 320px