Tcpkali: don't call aggregation fun for undefined metrics
Tcpkali: don't call aggregation fun for undefined metrics

machinezone/mzbench,timofey-barmin/mzbench,timofey-barmin/mzbench,timofey-barmin/mzbench,machinezone/mzbench,machinezone/mzbench,timofey-barmin/mzbench,machinezone/mzbench,machinezone/mzbench,timofey-barmin/mzbench