Respect response status code set in MethodOutcome of a Resource provider

[nathandoef]

Describe the bug
The response status code set in a MethodOutcome of a Resource provider is not respected.

To Reproduce

1. Register the custom Resource provider below:

public class ResponseCodeModifyingPatientProvider implements IResourceProvider {

	@Create()
	public MethodOutcome createPatient(@ResourceParam Patient thePatient, ServletRequest theServletRequest) {
		MethodOutcome methodOutcome = new MethodOutcome();
		methodOutcome.setResponseStatusCode(202);
		return methodOutcome;
	}

	@Override
	public Class<? extends IBaseResource> getResourceType() {
		return Patient.class;
	}
}

2. Create a Patient resource using an IGenericClient
3. Inspect the MethodOutcome
4. See that the response status code is 0

Expected behavior
The response status code of the MethodOutcome should be 202 (i.e. the value set in the custom Resource provider).