print task name on buf size log line

[josepowera]

It would be greate to printout taskname of kafka topic when we see buf size line.

Why? Because we quickly see what task name is fully using max buf size - and is therefore full power processing at the moment.

current:

2020/02/14 18:59:46  [1;34m[I] csv_dsp_dsprtbbids_raw tick [0m                                                                                                                                         
2020/02/14 18:59:46  [1;34m[I] buf size: 3575 [0m   

expected:

2020/02/14 18:59:46  [1;34m[I] csv_dsp_dsprtbbids_raw tick [0m      
2020/02/14 18:59:46  [1;34m[I] buf size: 3575 [0m   csv_dsp_dsprtbbids_raw 

[sundy-li]

Yes.