Fixed a broken link to CNI repo.
Fixed a broken link to CNI repo.

Review: https://reviews.apache.org/r/50769/

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