Set KMS client timeout using S3Client Config so that a timeout set on…

[1rjt]

… the S3Client also applies to the internal KMS client

Description

Set KMS Client config timeout from the S3 client config so that the setting applies to both the S3 client and internal KMS client.

Motivation and Context

Allows the S3 timeout to apply to the internal KMS client. E.g. lowering the S3 client timeout to abandon calls over say, 10 seconds is not possible because the internal KMS client will always call for 100 seconds as the default HttpClient timeout.

https://github.com/aws/amazon-s3-encryption-client-dotnet/issues/31

Testing

Screenshots (if appropriate)

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] My code follows the code style of this project
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly
• [ ] I have read the README document
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed

License

• [x] I confirm that this pull request can be released under the Apache 2 license

[normj]

This has been released as part of version 2.0.4. Thanks for the PR!