TS-2000: fix a typo in MgmtSchema
TS-2000: fix a typo in MgmtSchema

clang complaint: '_MGMT_SCHEMA_' is defined here; did you mean
'__MGMT_SCHEMA_'?
Yes, yes we did mean that.

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