Cleanups in containerizer.cpp.
Cleanups in containerizer.cpp.

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