process object_id as part os explicitAttrs
process object_id as part os explicitAttrs

we are now able tu include expression mixing attrs and object_ids like:
"explicitAttrs" : "attrA?['attrA',{object_id:'foo'}]:['attrB',{object_id:'bar'}]",

telefonicaid/iotagent-node-lib,telefonicaid/iotagent-node-lib,telefonicaid/iotagent-node-lib