Koschei: Make probes use collections page instead of stats

The stats page may load slower than expected due to database
performance issues (#9278).  Lets use collections view instead to
hopefully make OpenShift liveness and readiness probes more stable.

roles/openshift-apps/koschei/templates/frontend-deployment.yml

@@ -37,13 +37,13 @@ spec:
           timeoutSeconds: 1
           initialDelaySeconds: 5
           httpGet:
-            path: /stats
+            path: /collections
             port: 8080
         livenessProbe:
           timeoutSeconds: 1
           initialDelaySeconds: 30
           httpGet:
-            path: /stats
+            path: /collections
             port: 8080
       volumes:
       - name: config