Added validation of scheduler::Call inside /call handler.
Added validation of scheduler::Call inside /call handler.

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