boto / botocore / 1280

97%

Pull #448

travis-ci

Implement opt-in unsigned requests for clients.

This change makes it possible to override the signature version at client
creation time using a parameter. It also introduces the concept of an
advanced configuration object for clients:

```python
import botocore
from botocore.client import Config

config = Config(signature_version=botocore.UNSIGNED)
s3 = session.create_client('s3', config=config)
```

This does **not** move any existing parameters into the advanced
configuration object, and thus is not yet a breaking change. It
does include the following:

* Adds `botocore.UNSIGNED` as a sentinel to disable signing
* Updates `botocore.handlers.disable_signing` to use `botocore.UNSIGNED`
* Adds a `botocore.client.Config` object to store signature version
* Modifies client creation to use this new config
* Updated / new unit tests

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