Fix DummyTask exec params
Fix DummyTask exec params

Back in fb7fe261 we changed the core/required/sceduler.js to send 3 params to tasks: app, args and callback. Dummy task was never updated

nsipplswezey/nodal,abossard/nodal,keithwhor/nodal,rlugojr/nodal,nsipplswezey/nodal,abossard/nodal,nsipplswezey/nodal