TS-4153: incorrect sphinx version check
TS-4153: incorrect sphinx version check

CentOS 6 defaults to an older version of Sphinx without the manpage
writer. Make sure we return an error if the version check fails or
the manpage module is not present.

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