Disabled 'tasks.json' route in master due to MESOS-979.
Disabled 'tasks.json' route in master due to MESOS-979.

Review: https://reviews.apache.org/r/17924

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