Ceilometer Config element for custom pipeline

-These elements are for overwriting of default pipeline.yaml
 defined in ceilometer element install.d

There should a be config element taking json configuration,
though that is non-trivial problem that will likely go
in a follow up patch.

Change-Id: Ib0035f5a4359885a9a30c98fdecb86b940e9cb6a

elements/ceilometer-overcloud-config/README.md

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+Will overwrite the pipeline.yaml taken from the Ceilometer repository
+defined in ceilometer element install.d.

elements/ceilometer-overcloud-config/element-deps

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+os-apply-config
+ceilometer

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

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+---
+sources:
+    - name: meter_source
+      interval: 600
+      meters:
+          - "*"
+      sinks:
+          - meter_sink
+    - name: cpu_source
+      interval: 600
+      meters:
+          - "cpu"
+      sinks:
+          - cpu_sink
+    - name: disk_source
+      interval: 600
+      meters:
+          - "disk.read.bytes"
+          - "disk.read.requests"
+          - "disk.write.bytes"
+          - "disk.write.requests"
+      sinks:
+          - disk_sink
+    - name: network_source
+      interval: 600
+      meters:
+          - "network.incoming.bytes"
+          - "network.incoming.packets"
+          - "network.outgoing.bytes"
+          - "network.outgoing.packets"
+      sinks:
+          - network_sink
+sinks:
+    - name: meter_sink
+      transformers:
+      publishers:
+          - rpc://
+    - name: cpu_sink
+      transformers:
+          - name: "rate_of_change"
+            parameters:
+                target:
+                    name: "cpu_util"
+                    unit: "%"
+                    type: "gauge"
+                    scale: "100.0 / (10**9 * (resource_metadata.cpu_number or 1))"
+      publishers:
+          - rpc://
+    - name: disk_sink
+      transformers:
+          - name: "rate_of_change"
+            parameters:
+                source:
+                    map_from:
+                        name: "disk\\.(read|write)\\.(bytes|requests)"
+                        unit: "(B|request)"
+                target:
+                    map_to:
+                        name: "disk.\\1.\\2.rate"
+                        unit: "\\1/s"
+                    type: "gauge"
+      publishers:
+          - rpc://
+    - name: network_sink
+      transformers:
+          - name: "rate_of_change"
+            parameters:
+                source:
+                   map_from:
+                       name: "network\\.(incoming|outgoing)\\.(bytes|packets)"
+                       unit: "(B|packet)"
+                target:
+                    map_to:
+                        name: "network.\\1.\\2.rate"
+                        unit: "\\1/s"
+                    type: "gauge"
+      publishers:
+          - rpc://

elements/ceilometer-undercloud-config/README.md

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+Will overwrite the pipeline.yaml taken from the Ceilometer repository
+defined in ceilometer element install.d.

elements/ceilometer-undercloud-config/element-deps

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+os-apply-config
+ceilometer

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

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+---
+sources:
+    - name: host_source
+      interval: 600
+      meters:
+          - "hardware.*"
+      sinks:
+          - "meter_sink"
+      discovery:
+          - "tripleo_overcloud_nodes"
+sinks:
+    - name: meter_sink
+      transformers:
+      publishers:
+            - rpc://