KmsLoop: Add get property method
KmsLoop: Add get property method

Change-Id: I1b25c8b8c5580dc63187b15b5a3579d15578b413

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