Fixed the 'UnregisteredFrameworksAfterTearDown' test.
Fixed the 'UnregisteredFrameworksAfterTearDown' test.

Review: https://reviews.apache.org/r/53545/

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