Fixed a pid comparison in the scheduler driver.
Fixed a pid comparison in the scheduler driver.

Review: https://reviews.apache.org/r/15065

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