Remove Vec::free.
Remove Vec::free.

Vec::free releases the backing store but leaves the pointers dangling.
This is pretty unsafe and we already have clear() to do the same
thing safely.

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