Create polling.yaml from CeilometerDeployment

Summary

A polling.yaml file should be generated in the same manner as pipeline.yaml from the spec of a CeilometerDeployment. However, instead of being added to ceilometer-notification pods, it should be added to ceilometer-compute and ceilometer-central pods when specified.

MR for pipeline.yaml which could be used as a starting point: !1469 (diffs)

Use cases

Ceilometer workflows that use pipeline.yaml.

Proposal

To be discussed.

Specification

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this issue are to be interpreted in the spirit of RFC 2119, even though we're not technically doing protocol design.

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