2.1.0-beta2 breaks Azure Blog Storage (403)

[oscarwest]

After upgrading to 2.1.0-beta2 from 2.0.0 we start getting 403 on calls to Blog Storage.
After downgrading from 2.1.0-beta2 to 2.0.0 it works again without any additional changes.

Info:
netcoreapp1.0
"WindowsAzure.Storage": "7.2.1",

Error:
Breaks on if statement line
Response code 403
Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.

CloudBlobContainer blobContainer = blobClient.GetContainerReference(containerName); CloudBlockBlob a = blobContainer.GetBlockBlobReference(fileName); if (await a.ExistsAsync() == false) { throw new InvalidOperationException("Could not retrieve blob"); }

[SergeyKanzhelev]

Dup for #416 See workaround and update information there