recorderendpoint: Configure webm muxer as streamable
recorderendpoint: Configure webm muxer as streamable

Change-Id: I87fc4ba255101f6cbb73a49c161edaff53332fa7

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