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That commit doesn't fix anything but it is a better way to have
LinphoneFriendList objects created with a refcount to 1 systematically.

make sure normalized phone numbers are computed for each new subscription to take into account potentiel proxy config changes.

fix test (adjust waits to take into account that dialog expiration doesn't trigger a new refresh (we let the SUBSCRIBE transaction timeout to trigger a new one instead).

If multicast is used, create RTP socket with the same address familly as the multicast address, in order to workaround issues with dual stack sockets and multicast, especially on mac os.