k8s: worker: lower max number of workers in HPA

And also increase the CPU threshold from 0.25 to 0.35, to make it
use more CPU of current workers before requesting more workers
from the HPA.

Signed-off-by: Charles Oliveira <charles.oliveira@linaro.org>

Author: chaws

k8s/qareports-worker.yml

@@ -8,8 +8,8 @@ metadata:
   name: qareports-worker-autoscale
 spec:
   minReplicas: 1
-  maxReplicas: 10
-  targetCPUUtilizationPercentage: 15
+  maxReplicas: 3
+  targetCPUUtilizationPercentage: 25
   scaleTargetRef:
     apiVersion: apps/v1
     kind: Deployment