Fixed UserCgroupIsolatorTest to be more explicit.
Fixed UserCgroupIsolatorTest to be more explicit.

Review: https://reviews.apache.org/r/36601

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