kmselement: Add trace in finalize function
kmselement: Add trace in finalize function

Change-Id: I9bb7bdf4bd68cb078616ed4750848fc55911ec4d

ESTOS/kms-core,TribeMedia/kms-core,TribeMedia/kms-core,Kurento/kms-core,shelsonjava/kms-core,Kurento/kms-core,shelsonjava/kms-core,Kurento/kms-core,TribeMedia/kms-core,shelsonjava/kms-core,ESTOS/kms-core,ESTOS/kms-core,Kurento/kms-core,TribeMedia/kms-core,ESTOS/kms-core,shelsonjava/kms-core