Make sure all init scripts has JOBS and NODE_TEST_DIR

[jbergstroem]

We should populate the environment variable JOBS through ansible facts. This way we can better control parallelism in both compilation and upcoming testing.

[jbergstroem]

..also, now that NODE_COMMON_PIPE is superseded by NODE_TEST_DIR, we should set these in the init scripts as well. The path should point to a temporary folder which is on the same filesystem as where nodejs is built (it for instance needs to be /home/iojs/build on arm since its mounted through nfs).

[jbergstroem]

Question: now that these commits has been merged to 0.10 and 0.12 branches, do we want to continue supporting NODE_COMMON_PIPE moving forward in CI? Not setting it will potentially generate a fail for really old stuff; but I don't really see where or why we'd test against older branches.

[gibfahn]

Question [...] do we want to continue supporting NODE_COMMON_PIPE moving forward in CI?

No! We should definitely remove this going forward.

[Trott]

Closing due to long period of inactivity. Feel free to re-open if this is a thing. I'm just trying to close stuff that has been ignored for sufficiently long that it seems likely it's not something we're going to get to.