Removed namespaces in "hierarchical.cpp".
Removed namespaces in "hierarchical.cpp".

Review: https://reviews.apache.org/r/40180

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