Comment 2 for bug 1313016

Actually, the format of arguments to set annotations has been made consistent with the rest of code base based on advice from William.

The client now will take a list of entities and their corresponding annotations, thus setting different annotations on individual entity from the entities list in one call.

E.g. entity a will be annotated with pairs1 whereas entity b with pairs2.
......{
            "Type": "Annotations",
            "Request": "Set",
            "Params": {
                 "Annotations": {
                     {"Entity": a, "Annotations": pairs1},
                     {"Entity": b, "Annotations": pairs2}
                 }
             }
}......