Using arithmetic transformers in pipeline

Arithmetic transformers has been just finished in Ceilometer.
That allows us to move very ugly computation of percentage
from TripleO-UI to Ceilometer pipeline, where it belongs.

Adding computation of swap and cpu utilization.

Change-Id: I69fc1b4ebf740e34d24b26eff922b6b40e72c08a

elements/ceilometer-undercloud-config/os-apply-config/etc/ceilometer/pipeline.yaml

@@ -1,4 +1,3 @@
----
 sources:
     - name: host_source
       interval: 600
@@ -6,10 +5,34 @@ sources:
           - "hardware.*"
       sinks:
           - "meter_sink"
+          - "cpu_sink"
+          - "swap_sink"
       discovery:
           - "tripleo_overcloud_nodes"
 sinks:
     - name: meter_sink
       transformers:
       publishers:
-            - rpc://
+          - rpc://
+    - name: cpu_sink
+      transformers:
+          - name: "arithmetic"
+            parameters:
+                target:
+                    name: "hardware.system_stats.cpu.util"
+                    unit: "%"
+                    type: "gauge"
+                    expr: "100 - $(hardware.system_stats.cpu.idle)"
+      publishers:
+          - rpc://
+    - name: swap_sink
+      transformers:
+          - name: "arithmetic"
+            parameters:
+                target:
+                    name: "hardware.memory.swap.util"
+                    unit: "%"
+                    type: "gauge"
+                    expr: "100 - (100 * $(hardware.memory.swap.avail) / $(hardware.memory.swap.total))"
+      publishers:
+          - rpc://