Fix signature::canonical_uri to produce invalid uri

[xDarksome]

Fixes #1700

CHANGELOG:

• Fix signature::canonical_uri to produce invalid uri when Region::Custom::endpoint has / as path (eg. localhost:5555/).

[tyranron]

@iliana @benesch would you be so kind to look at this?

[benesch]

I'm sorry, but I no longer have any time to spend on Rusoto. We've completely transitioned our projects at Materialize over to the official AWS Rust SDK: http://github.com/awslabs/aws-sdk-rust.

…

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