TS-1834: logstats fails with a missing log directory
TS-1834: logstats fails with a missing log directory

traffic_logstats fails when the log directory is missing or not
configured. But really, we only need the log directory in incremental
mode.

rahmalik/trafficserver,chenglongwei/trafficserver,persiaAziz/trafficserver,pbchou/trafficserver,rpufky/trafficserver,taoyunxing/trafficserver,chitianhao/trafficserver,clearswift/trafficserver,dyrock/trafficserver,duke8253/trafficserver,chenglongwei/trafficserver,bryancall/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,SolidWallOfCode/trafficserver,taoyunxing/trafficserver,chitianhao/trafficserver,chenglongwei/trafficserver,reveller/trafficserver,taoyunxing/trafficserver,clearswift/trafficserver,taoyunxing/trafficserver,vmamidi/trafficserver,reveller/trafficserver,chenglongwei/trafficserver,reveller/trafficserver,rpufky/trafficserver,persiaAziz/trafficserver,clearswift/trafficserver,SolidWallOfCode/trafficserver,chenglongwei/trafficserver,PSUdaemon/trafficserver,vmamidi/trafficserver,reveller/trafficserver,persiaAziz/trafficserver,chenglongwei/trafficserver,bryancall/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,clearswift/trafficserver,rahmalik/trafficserver,taoyunxing/trafficserver,SolidWallOfCode/trafficserver,rpufky/trafficserver,taoyunxing/trafficserver,rahmalik/trafficserver,dyrock/trafficserver,rpufky/trafficserver,PSUdaemon/trafficserver,persiaAziz/trafficserver,PSUdaemon/trafficserver,chitianhao/trafficserver,taoyunxing/trafficserver,persiaAziz/trafficserver,PSUdaemon/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,dyrock/trafficserver,taoyunxing/trafficserver,reveller/trafficserver,persiaAziz/trafficserver,taoyunxing/trafficserver,davidbz/trafficserver,bryancall/trafficserver,reveller/trafficserver,rahmalik/trafficserver,chenglongwei/trafficserver,rahmalik/trafficserver,bryancall/trafficserver,rpufky/trafficserver,clearswift/trafficserver,bryancall/trafficserver,pbchou/trafficserver,rahmalik/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,rpufky/trafficserver,dyrock/trafficserver,reveller/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,reveller/trafficserver,davidbz/trafficserver,PSUdaemon/trafficserver,duke8253/trafficserver,clearswift/trafficserver,reveller/trafficserver,PSUdaemon/trafficserver,duke8253/trafficserver,clearswift/trafficserver,rpufky/trafficserver,clearswift/trafficserver,vmamidi/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver,persiaAziz/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,rahmalik/trafficserver,duke8253/trafficserver,rpufky/trafficserver,chitianhao/trafficserver,chenglongwei/trafficserver,PSUdaemon/trafficserver,dyrock/trafficserver,pbchou/trafficserver,duke8253/trafficserver,pbchou/trafficserver,duke8253/trafficserver,dyrock/trafficserver,rpufky/trafficserver,SolidWallOfCode/trafficserver,clearswift/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,rahmalik/trafficserver,PSUdaemon/trafficserver