allow dax:DescribeClusters for zmon

so we can detect them and create entities

Author: vetinari

cluster/cluster.yaml

@@ -1468,6 +1468,9 @@ Resources:
               - Action: 'cloudwatch:List*'
                 Effect: Allow
                 Resource: '*'
+              - Action: 'dax:DescribeClusters'
+                Effect: Allow
+                Resource: '*'
               - Action: 'ec2:Describe*'
                 Effect: Allow
                 Resource: '*'