CITGM job runs out of space on AIX

[richardlau]

e.g. https://ci.nodejs.org/job/citgm-smoker/2466/nodes=aix71-ppc64/console

...
02:59:43 sed: couldn't write 43 items to stdout: There is not enough space in the file system.
02:59:43 gmake[1]: *** [tools/v8_gypfiles/v8_initializers.target.mk:380: /home/iojs/build/workspace/citgm-smoker/nodes/aix71-ppc64/node/out/Release/obj.target/v8_initializers/gen/torque-output-root/torque-generated/../../deps/v8/src/builtins/typed-array-every-tq-csa.o] Error 4
02:59:43 gmake[1]: *** Waiting for unfinished jobs....
02:59:44 sed: couldn't write 46 items to stdout: There is not enough space in the file system.
02:59:44 grep_64: write error: There is no process to read data written to a pipe.
02:59:44 gmake[1]: *** [tools/v8_gypfiles/v8_initializers.target.mk:380: /home/iojs/build/workspace/citgm-smoker/nodes/aix71-ppc64/node/out/Release/obj.target/v8_initializers/gen/torque-output-root/torque-generated/../../deps/v8/src/builtins/typed-array-filter-tq-csa.o] Error 4
02:59:54 /home/iojs/build/workspace/citgm-smoker/nodes/aix71-ppc64/node/out/Release/obj/gen/torque-output-root/torque-generated/../../deps/v8/src/builtins/torque-internal-tq-csa.cc:782:1: fatal error: closing dependency file /home/iojs/build/workspace/citgm-smoker/nodes/aix71-ppc64/node/out/Release/.deps//home/iojs/build/workspace/citgm-smoker/nodes/aix71-ppc64/node/out/Release/obj.target/v8_initializers/gen/torque-output-root/torque-generated/../../deps/v8/src/builtins/torque-internal-tq-csa.o.d.raw: No space left on device
02:59:54  }  // namespace v8
02:59:54  ^
02:59:54 compilation terminated.
...

For some background history we previously made changes to the job in #1908 (comment) which should still be in effect. We're now running on the AIX 7.1 machines (we ditched the 6.1 ones some time ago) but also the Node.js builds have been steadily getting larger which each release (the CITGM job builds Node.js in addition to space required to download and test modules).

cc @AshCripps

[AshCripps]

Turns out the machines have a very decent sized disk and we are not using it for some reason (probs my fault I set these machines up IIRC). Ive added 10G under /home to both test machine and the release machine but it is very easy to add more if needed later on