rtsp-media: Fix multicast use case with common media.
Use case client 1: SETUP client 1: PLAY client 2: SETUP client 1: TEARDOWN client 2: PLAY client 2: TEARDOWN
Change-Id: I556a027328777d573da0b7db8d0fd565cf6f8459
Use case client 1: SETUP client 1: PLAY client 2: SETUP client 1: TEARDOWN client 2: PLAY client 2: TEARDOWN
Change-Id: I556a027328777d573da0b7db8d0fd565cf6f8459