Fixed conflict in hook result handling.
Fixed conflict in hook result handling.

Review: https://reviews.apache.org/r/54165/

jpeach/mesos,neilconway/mesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,abudnik/mesos,yuquanshan/customizedMesos,asamerh4/mesos,craimbert/mesos,chhsia0/mesos,neilconway/mesos,verizonlabs/mesos,verizonlabs/mesos,kaysoky/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,gsantovena/mesos,reneploetz/mesos,chhsia0/mesos,verizonlabs/mesos,jpeach/mesos,abudnik/mesos,zmalik/mesos,yuquanshan/customizedMesos,chhsia0/mesos,zmalik/mesos,dforsyth/mesos,verizonlabs/mesos,dforsyth/mesos,neilconway/mesos,abudnik/mesos,Gilbert88/mesos,asamerh4/mesos,abudnik/mesos,craimbert/mesos,zmalik/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,chhsia0/mesos,gsantovena/mesos,andschwa/mesos,Gilbert88/mesos,neilconway/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,craimbert/mesos,yuquanshan/customizedMesos,andschwa/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,Gilbert88/mesos,reneploetz/mesos,Gilbert88/mesos,asamerh4/mesos,asamerh4/mesos,andschwa/mesos,abudnik/mesos,verizonlabs/mesos,dforsyth/mesos,andschwa/mesos,Gilbert88/mesos,chhsia0/mesos,neilconway/mesos,craimbert/mesos,craimbert/mesos,kaysoky/mesos,asamerh4/mesos,andschwa/mesos,reneploetz/mesos,abudnik/mesos,gsantovena/mesos,dforsyth/mesos,kaysoky/mesos,zmalik/mesos,reneploetz/mesos,yuquanshan/customizedMesos,chhsia0/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,neilconway/mesos,zmalik/mesos,asamerh4/mesos,chhsia0/mesos,zmalik/mesos,gsantovena/mesos,craimbert/mesos,abudnik/mesos,reneploetz/mesos,gsantovena/mesos,jpeach/mesos,jpeach/mesos,andschwa/mesos,verizonlabs/mesos,yuquanshan/customizedMesos,Gilbert88/mesos,zmalik/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,gsantovena/mesos,andschwa/mesos,craimbert/mesos,reneploetz/mesos,kaysoky/mesos,jpeach/mesos,neilconway/mesos,kaysoky/mesos,gsantovena/mesos,jpeach/mesos