Please add tempdir to Ubuntu 1604

[MylesBorins]

Consistently seeing failures with Readable stream in CITGM

 Error: ENOENT: no such file or directory, lstat '/home/iojs/tmp'
               at Error (native)
               at Object.fs.lstatSync (fs.js:994:11)
               at Object.realpathSync (fs.js:1676:21)
               at Object.<anonymous> (/home/iojs/build/workspace/citgm-smoker/nodes/ubuntu1604-64/citgm_tmp/fbb8bac7-e783-424b-96cf-4a288b300a2e/readable-stream/test/common.js:69:47)
               at Module._compile (module.js:570:32)
               at Object.Module._extensions..js (module.js:579:10)
               at Module.load (module.js:487:32)
               at tryModuleLoad (module.js:446:12)
               at Function.Module._load (module.js:438:3)
               at Module.require (module.js:497:17)
         command: "/home/iojs/build/workspace/citgm-smoker/nodes/ubuntu1604-64/smoker/bin/node test-stream-big-packet.js"

[gibfahn]

Isn't this what #785 (and previously #658) aim to do?

Seems like a dup.

[rvagg]

oh, you know ... on occasion I've deleted that directory in general cleanup of machines that need cleaning up, this could very well be my fault on particular machines, will try and remember not to be overzealous with cleaning in future