Fixed a compiler warning in cgroups memory pressure tests.
Fixed a compiler warning in cgroups memory pressure tests.

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