Added /dev/fd to the list of symlinks created by filesystem/linux.
Added /dev/fd to the list of symlinks created by filesystem/linux.

This is necessary to enable bash subshell redirection within the
container.

Review: https://reviews.apache.org/r/48240/

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