Adding fec_decode config for fec "decode only" scenario.
FEC encode will still be controlled by fec_group_size. (fec_group_size = 0, fec_decode = 1 means this node only do decode and will not sending any FEC frames).
Merge multi-line node perf log into one.
Adding fec_decode config for fec "decode only" scenario. FEC encode will still be controlled by fec_group_size. (fec_group_size = 0, fec_decode = 1 means this node only do decode and will not sending any FEC frames). Merge multi-line node perf log into one.