KmsHttpEPServer: Stop internal pipeline when clients disconnect
KmsHttpEPServer: Stop internal pipeline when clients disconnect

Change-Id: Ief5f1870f4b087a35b8e4dbacc9c9a6a3e0d6e34

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