TS-4298: Breakdown parameter checks in Http2::init()
TS-4298: Breakdown parameter checks in Http2::init()

This closes #539

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