Greengrass reset_deployments responds with 403 AccessDeniedException

[jon-lewis]

When calling the reset_deployments method on the GreengrassClient, you will get a 403 error like so:

Error: Unknown( BufferedHttpResponse {status: 403, body: "{\"Message\":\"Unable to determine service/operation name to be authorized\"}"

This is due to the URL of reset_deployments containing a '$'. The AWS API is expecting a '$' in the URL and '$' to be encoded in the signature. Currently, signature.rs is encoding $ in the URL which I believe is incorrect.

[jon-lewis]

PR