MXS-1220: Add support for PATCH

The PATCH method should now be used instead the PUT method to update
resources.  As PUT request bodies should represent complete resources, the
use of PUT to update resources is no longer supported.

Altered tests to use PATCH instead of PUT for updating resources.

Documentation/REST-API/Resources-Service.md

@@ -265,7 +265,7 @@ The _:name_ in the URI must map to a service name and the request body must be a
 valid JSON Patch document which is applied to the resource.
 
 ```
-PUT /v1/services/:name
+PATCH /v1/services/:name
 ```
 
 The following standard service parameters can be modified.