Harshavardhana b62cd8ed84 sign/streaming: Content-Encoding is not set in newer aws-java-sdks (#3986)
We can't use Content-Encoding to verify if `aws-chunked` is set
or not. Just use 'streaming' signature header instead.

While this is considered mandatory, on the contrary aws-sdk-java
doesn't set this value

http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-streaming.html

```
Set the value to aws-chunked.
```

We will relax it and behave appropriately. Also this PR supports
saving custom encoding after trimming off the `aws-chunked`
parameter.

Fixes #3983
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