Investigate flaky test parallel/test-process-getactivehandles

[orangemocha]

Flaky on ARM on current master:

https://ci.nodejs.org/job/node-stress-single-test/504/nodes=pi2-raspbian-wheezy/console

not ok 1 test-process-getactivehandles.js
# TIMEOUT
  ---
  duration_ms: 120.54

cc @nodejs/testing

[Trott]

/cc @trevnorris

[trevnorris]

More pi2 fun.

[trevnorris]

how often is this flakey? I've been trying it out on a pi2 machine and hasn't failed for me.

[orangemocha]

In the CI run (https://ci.nodejs.org/job/node-stress-single-test/504/nodes=pi2-raspbian-wheezy/console) it failed 2 times out of 100. We can start a longer run if you need more data.

[trevnorris]

May have a fix for this. Will PR it soon.

[trevnorris]

Linked a fix for the test.