Increase upper cpu limit

So that cluster is less likely to resize during tests

Author: duncangrant

kubernetes/tests/kubernetes/tests.default.bom

@@ -27,5 +27,6 @@ brooklyn.catalog:
           kubernetes.minRam: 2000
           kubernetes.minCores: 1
           autoscaler.resizeUpStabilizationDelay: 60s
+          kubernetes.scaling.cpu.limit: 2.0
         services:
           - type: kubernetes-cluster-tests