Update storage spec to 2016-05-01

[JasonYang-MSFT]

1. updated swagger version.
2. add parameter client name to avoid breakings.
3. updated autorest version, which has the parameter "ClientName"

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[amarzavery]

@JasonYang-MSFT - The storage tests are failing. Please update the tests as per the current changes in the swagger spec and record them. https://github.com/Azure/azure-sdk-for-node/tree/master/Documentation Step 4: testing the sdk should be of help if you need to find anything