[RAT-168] Add integration test for apache-rat:rat to catch NPE
Use the correct annotation for this kind of @Parameter. The "property" option is used for parameters that can be set from the command line as a system property using -D, but this parameter is read only so we should not use that. Instead we want the parameter to have a default value injected with the current project. The IT (it4_RAT-168) that was added for this issue still passes with this change.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/trunk@1618026 13f79535-47bb-0310-9956-ffa450edef68
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