agent: warn when closing the agent with alive turn refreshes
requested to merge bellet/libnice:MR-agent-keep-a-ref-on-the-agent-while-removal-of-TURN-refreshes into master
This first patch suggests the developer to close its alive reservations on the turn server before disposing the agent, and the second patch deletes refreshes that can be safely freed on agent disposal.
Edited by Fabrice Bellet