Added a new line to keep two lines for group::internal namespace.
Added a new line to keep two lines for group::internal namespace.

Review: https://reviews.apache.org/r/51315/

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