investigate flaky test-http-server-consumed-timeout on FreeBSD

[Trott]

https://ci.nodejs.org/job/node-test-commit-freebsd/4930/nodes=freebsd10-64/console on test-joyent-freebsd10-x64-1:

not ok 549 parallel/test-http-server-consumed-timeout
# 
# assert.js:85
#   throw new assert.AssertionError({
#   ^
# AssertionError: Request timeout should not fire
#     at Object.exports.fail (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd10-64/test/common.js:443:10)
#     at IncomingMessage.req.setTimeout (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd10-64/test/parallel/test-http-server-consumed-timeout.js:13:12)
#     at emitOne (events.js:96:13)
#     at IncomingMessage.emit (events.js:188:7)
#     at Socket.<anonymous> (_http_server.js:311:50)
#     at emitNone (events.js:86:13)
#     at Socket.emit (events.js:185:7)
#     at Socket._onTimeout (net.js:342:8)
#     at ontimeout (timers.js:365:14)
#     at tryOnTimeout (timers.js:237:5)
  ---
  duration_ms: 1.539