Investigate flaky test-http-regr-gh-2928

[Trott]

Example failure:

• pi1-raspbian-wheezy

/cc @indutny

[Trott]

Another one: https://ci.nodejs.org/job/node-test-binary-arm/934/RUN_SUBSET=3,nodes=pi2-raspbian-wheezy/tapTestReport/test.tap-138/

[rvagg]

armv7, pi2, 2 consecutive runs: https://ci.nodejs.org/job/node-test-binary-arm/944/RUN_SUBSET=4,nodes=pi2-raspbian-wheezy/console & https://ci.nodejs.org/job/node-test-binary-arm/945/RUN_SUBSET=4,nodes=pi2-raspbian-wheezy/console

[Trott]

It is failing almost every time on the pi2-raspbian-wheezy lately:

• build 989
• build 988
• build 986
• build 985
• build 983
• build 982
• build 981
• build 980
• build 978
• build 977
• build 976

/cc @indutny