Fixed missing cloexec and switched to io::redirect in MesosContainerizer.
Fixed missing cloexec and switched to io::redirect in MesosContainerizer.

Review: https://reviews.apache.org/r/22001

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