kmswebrtcendpoint: use "max-video-recv-bandwidth" to limit local REMB

Change-Id: I828dd8ae2456792062253ae7ee681322f3130bba
kmswebrtcendpoint: send REMB event on connect

Change-Id: I932b88c7dde2ad59934a2848c61c62ad76e33920
WebRtcEndpoint: add properties for min and max video send bandwidth

Change-Id: I2cf832581cab3242ee15cd5abe1d5b6ab61b1d7c
kmswebrtcendpoint: keep bitrate for REMB event between the range

Change-Id: I04ebaaaa954b47573d2d2f9e1ba97a22ade7c075