kmsrecorderendpoint: Finish internal thread execution on dispose call
kmsrecorderendpoint: Finish internal thread execution on dispose call

Change-Id: If17877a370d143750dae96092990da821c83eb03

Kurento/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements