Fix TODOs in source code

[atodorov]

$ grep todo * -iR

api/KiwiProductJsonRpcClient.java:        // TODO: move classification filtering in emitter
api/KiwiProductJsonRpcClient.java:    // TODO: Create Category class
api/KiwiJsonRpcClient.java:    //TODO: Seems a bad practice, remove/replace
api/KiwiJsonRpcClient.java:    // TODO: Create Category class
api/KiwiTestingJsonRpcClient.java:        // TODO: remove call for plan type
api/KiwiTestingJsonRpcClient.java:    // TODO: Create TestCaseStatus class
model/TestMethod.java://todo: this must be coming from the database, not hard-coded

The last one is #57. For the rest it is probably best to examine them by hand initially and open separate issues for each of them.