Investigate flaky parallel/test-force-repl on Windows

[Trott]

version 7.0.0-pre (current master)

https://ci.nodejs.org/job/node-test-binary-windows/3724/RUN_SUBSET=3,VS_VERSION=vcbt2015,label=win10/console:

not ok 78 parallel/test-force-repl
# c:\workspace\node-test-binary-windows\RUN_SUBSET\3\VS_VERSION\vcbt2015\label\win10\test\parallel\test-force-repl.js:10
#   throw new Error('timeout!');
#   ^
# 
# Error: timeout!
#     at Timeout._onTimeout (c:\workspace\node-test-binary-windows\RUN_SUBSET\3\VS_VERSION\vcbt2015\label\win10\test\parallel\test-force-repl.js:10:9)
#     at tryOnTimeout (timers.js:232:11)
#     at Timer.listOnTimeout (timers.js:202:5)
  ---
  duration_ms: 3.123
  ...

Looks like the 1 second timeout is probably too short. Doesn't seem to be any reason not to move it up to 5 seconds or something, so that's what I'll do.

In the meantime, stress test: https://ci.nodejs.org/job/node-stress-single-test/906/nodes=win10/console