Investigate flaky test-cluster-worker-init on Raspberry Pi 1

[Trott]

https://ci.nodejs.org/job/node-test-binary-arm/3930/RUN_SUBSET=3,label=pi1-raspbian-wheezy/console

not ok 24 parallel/test-cluster-worker-init
# 
# assert.js:85
#   throw new assert.AssertionError({
#   ^
# AssertionError: message not received
#     at Timeout._onTimeout (/home/iojs/build/workspace/node-test-binary-arm/test/parallel/test-cluster-worker-init.js:14:5)
#     at Timer.unrefdHandle (timers.js:460:14)

/cc @cjihrig

[imyller]

Possibly resolved. PR coming soon.

Stress test CI with pi1 looks promising:
https://ci.nodejs.org/job/node-stress-single-test-pi1-binary/label=pi1-raspbian-wheezy/14/

[imyller]

@Trott IMHO it was a good idea to open an issue for investigating this one. 👍

I know there are more testing issues causing arm-fanned CI group failures. Maybe you could open "investigate" issues for those as well. More people can jump in to sort them out.