Fixed flaky FaultToleranceTest.SchedulerFailoverStatusUpdate.
Fixed flaky FaultToleranceTest.SchedulerFailoverStatusUpdate.

From: Jiang Yan Xu <e958ec5a56cd9794647c3623b3aa5a85122e74a5@jxu.me>
Review: https://reviews.apache.org/r/15946

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