Azure - CosmosDB Replace Offer Action

[axis7818]

Support for ReplaceOffer on CosmosDB Collections

Addresses #4311

• Created CosmosDBReplaceOfferAction and refactored shared code with CosmosDBOfferFilter
  • This action does not operate on individual resources since the offer lives on the account. So, the _process_resource is ignored and _process_resources is overridden instead.
• CosmosDBChildResource.get_cosmos_key was modified to get read & write keys instead of read only keys.

Example Policy

Limit offer throughput to 400 RU/s

policies:
  - name: replace-offer-action
    resource: azure.cosmosdb-collection
    filters:
      - type: offer
        key: content.offerThroughput
        op: gt
        value: 400
    actions:
      - type: replace-offer
        throughput: 400

[stefangordon]

I like the refactor.

[stefangordon]

If you want you can enforce >0 (and even maximum, if there is one) here. 'throughput': {'type': 'number', 'minimum': 0}