Add nodejs:10 runtime support to default deployments

[csantanapr]

Title: Add nodejs:10 runtime support to default deployments

1. Add nodejs:10 to core ansible/vagrant deploy

• Add nodejs:10entry into ansible/files/runtimes.json

"nodejs": [
    {
        "kind": "nodejs:10",
        "default": true,
        "deprecated": false,
        "attached": {
            "attachmentName": "codefile",
            "attachmentType": "text/plain"
        },
        "image": {
            "prefix": "openwhisk",
            "name": "action-nodejs-v10",
            "tag": "latest"
        }
    }
]

• Update and add doc file into docs/action_node.md
• Update unicode tests https://github.com/apache/incubator-openwhisk/tree/master/tests/dat/actions/unicode.tests

3. Add nodejs:10 to docker-compose deploy

• Add nodejs:10 into runtime manifest
  https://github.com/apache/incubator-openwhisk-devtools/blob/master/docker-compose/docker-whisk-controller.env#L64

4. Add nodejs:10 to deploy-kube

• Add nodejs:10 into runtime manifest
  https://github.com/apache/incubator-openwhisk-deploy-kube/blob/master/helm/openwhisk/runtimes.json

5. Update wskdeploy with nodejs:10

Update spec, and tests for nodejs:10

6 Update website with nodejs:10

Update js action section with nodejs:10

[csantanapr]

All 5 PRs are now merged, closing 🎉
Thanks @dgrove-oss for all the reviews 👍