Add ContainerImage protobuf.
Add ContainerImage protobuf.

Review: https://reviews.apache.org/r/34136

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