Add a test for 'with-items' task: count=100, concurrency=10

Change-Id: I83429edbd59aa00c52ac2e247e7de2c79cb90887

rally-jobs/extra/scenarios/with_items/count_100_concurrency_10.json

@@ -0,0 +1,4 @@
+{
+  "count": 100,
+  "concurrency": 10
+}

rally-jobs/extra/scenarios/with_items/wb.yaml

@@ -0,0 +1,16 @@
+---
+version: '2.0'
+
+name: with_items_wb
+
+workflows:
+  wf:
+    input:
+      - count: 10
+      - concurrency: 0
+
+    tasks:
+      task1:
+        with-items: i in <% range(0, $.count) %>
+        action: std.echo output=<% $.i %>
+        concurrency: <% $.concurrency %>

rally-jobs/task-mistral.yaml

@@ -108,6 +108,24 @@
         users:
           tenants: 1
           users_per_tenant: 1
+      sla:
+        failure_rate:
+          max: 0
+
+    -
+      args:
+        definition: "/home/jenkins/.rally/extra/scenarios/with_items/wb.yaml"
+        params:
+          "/home/jenkins/.rally/extra/scenarios/with_items/count_100_concurrency_10.json"
+        do_delete: true
+      runner:
+        type: "constant"
+        times: 20
+        concurrency: 5
+      context:
+        users:
+          tenants: 1
+          users_per_tenant: 1
       sla:
         failure_rate:
           max: 0