[GitHub] rabbah opened a new pull request #3716: Augment RuntimeManifest with stem cell configuration per kind.

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rabbah opened a new pull request #3716: Augment RuntimeManifest with stem cell configuration per kind.
URL: https://github.com/apache/incubator-openwhisk/pull/3716
 
 
   This is a replay of https://github.com/apache/incubator-openwhisk/pull/3669 with a proper commit message.
   
   Constructs prewarming configuration from runtime manifest and its stem cell declarations.
   As an example:
   
     "nodejs": [
       {
         "kind": "nodejs:6",
         "default": true,
         "image": {
           "name": "nodejs6action"
         },
         "deprecated": false,
         "stemCells": [{
           "count": 2,
           "memory": "256 MB"
         }]
       }
     ]
   
   The configuration is parsed so that the count must be positive and the memory size a valid instance of ByteSize.
   The invokers will create the stemcells for the runtimes as specified in the manifest.
   
   The stem cell details are not reported in the deployment manifest (i.e., curl https://apihost).
   
   ## Related issue and scope
   <!--- Please include a link to a related issue if there is one. -->
   - [x] I opened an issue to propose and discuss this change (See #3669)
   
   ## My changes affect the following components
   <!--- Select below all system components are affected by your change. -->
   <!--- Enter an `x` in all applicable boxes. -->
   - [ ] API
   - [x] Controller
   - [ ] Message Bus (e.g., Kafka)
   - [ ] Loadbalancer
   - [x] Invoker
   - [ ] Intrinsic actions (e.g., sequences, conductors)
   - [ ] Data stores (e.g., CouchDB)
   - [ ] Tests
   - [ ] Deployment
   - [ ] CLI
   - [ ] General tooling
   - [ ] Documentation
   
   ## Types of changes
   <!--- What types of changes does your code introduce? Use `x` in all the boxes that apply: -->
   - [ ] Bug fix (generally a non-breaking change which closes an issue).
   - [x] Enhancement or new feature (adds new functionality).
   - [ ] Breaking change (a bug fix or enhancement which changes existing behavior).
   
   ## Checklist:
   <!--- Please review the points below which help you make sure you've covered all aspects of the change you're making. -->
   
   - [x] I signed an [Apache CLA](https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md).
   - [x] I reviewed the [style guides](https://github.com/apache/incubator-openwhisk/wiki/Contributing:-Git-guidelines#code-readiness) and followed the recommendations (Travis CI will check :).
   - [ ] I added tests to cover my changes.
   - [ ] My changes require further changes to the documentation.
   - [ ] I updated the documentation where necessary.
   
   

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