Adjust parameter values and config.json file

[MarcoDima]

1. If request is sent with accepts_incomplete=false, but no request body is sent within it, then the status code should be 400 and not 422.

2. An id like service_id="xxxx-xxxx" MIGHT be considered a valid id, as it can be globally unique and is not an empty string (as specified in the API).

3. on DELETE/BINDING: When testing the deletion of an instance (or an instance_binding), an existing "instance_id" and "binding_id" should be given in the config.json file (in the path: "bindings") otherwise the test case would create a new guid and delete an instance (or instance_binding) with that guid, which not exists as it was not created.

[cfdreddbot]

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[kirederik]

I think you accidentally committed the Mac OS ".DS_Store" files.

[leonwanghui]

Hi, how is it going about this patch?

[zhongyi-zhang]

@MarcoDima apologize for that we've redesigned the config file via #50. Therefore the PR is not compatible now :(. I am happy to review it if you'd like to create a new PR adjusting the current test framework. Your contributions are always appreciated!