As more and more production system uses openwhisk,
Users will need some features to protect their service safe from mistake.
If we have this feature, user can protect their actions from deletion by 
mistake.

When users create action use like below(add `protection=true` request param)
```
curl  -X PUT -H "Content-type: application/json"  --user 
23bc46b1-71f6-4ed5-8c54-816aa4f8c502:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCGuMDGIwP
 
-d 
'{"namespace":"guest","name":"hello","exec":{"kind":"nodejs:default","code":"// 
Licensed to the Apache Software Foundation (ASF) under one or more 
contributor\r\n// license agreements; and to You under the Apache License, 
Version 2.0.\r\n\r\n/**\r\n * Hello, world.\r\n */\r\nfunction main() {\r\n 
return {\"payload\":\"Hello world\"};\r\n}\r\n"}}' 
'http://xxx.xxx.xxx.xxx:port/api/v1/namespaces/guest/actions/hello?protection=true'
```
The protection will be added in couchdb's  annotation, like below
```
...
  "annotations": [
    {
      "key": "exec",
      "value": "nodejs:6"
    },
    {
      "key": "protection",
      "value": "true"
    }
...
```
So this action can't be deleted until the protection is updated to `false`

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## Description
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## Related issue and scope
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- [ ] I updated the documentation where necessary.



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https://github.com/apache/incubator-openwhisk/pull/4058 ]
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