Fixes the escalate plugin such that redirects are followed
Fixes the escalate plugin such that redirects are followed

Or any other plugin using the TSHttpTxnRedirectUrlSet().

This closes #2924

SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,pbchou/trafficserver,dyrock/trafficserver,dyrock/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,persiaAziz/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,persiaAziz/trafficserver,pbchou/trafficserver,dyrock/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,bryancall/trafficserver,pbchou/trafficserver,duke8253/trafficserver,bryancall/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,persiaAziz/trafficserver,duke8253/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,pbchou/trafficserver,pbchou/trafficserver,pbchou/trafficserver,davidbz/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,bryancall/trafficserver,duke8253/trafficserver