[util] remove utterly useless destroySession method
[util] remove utterly useless destroySession method

nseckinoral/nodecg,nodecg/nodecg,madmatt/nodecg,nodecg/nodecg,IgorCandido/igrcnddStreamNotifications,IgorCandido/igrcnddStreamNotifications,nodecg/nodecg,madmatt/nodecg,nseckinoral/nodecg