TS-580 Add back support for using the default DNSHandler from DNS.cc.
TS-580 Add back support for using the default DNSHandler from DNS.cc.

This fixes the problem with PTR lookups etc. failing with
SplitDNS enabled (since that doesn't use it's own default
handler ... ).

Author: qianshi
Review: Leif

git-svn-id: 2dd0c813ec5e66d7196e5ee63433c56c88d5b4b7@1043135 13f79535-47bb-0310-9956-ffa450edef68

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