Upgrade ghodss/yaml, fixes #2763
Turn on node level validation, and make the validation set dynamic.
Add node status to API object (all versions).
Merge pull request #2855 from brendandburns/validatez

Turn on node level validation, and make the validation set dynamic.
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Merge pull request #2315 from ddysher/node-status

Add node status to API object.
Merge pull request #2819 from ghodss/upgrade-ghodss-yaml

Upgrade ghodss/yaml, fixes #2763
Merge pull request #2866 from brendandburns/build

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refactor scheduler factory to use plugin architecture style like credentialprovider and cloudprovider for configuring priority functions and fit predicates.