Test: iOS flaky tests need investigation

[orangemocha]

The following tests are flaky on both iOS 9 and 10, using our new test app, and need to be investigated.

test-https-agent.js
test-memory-usage-emfile.js
test-net-server-max-connections.js
test-tls-client-reject.js
test-tls-hello-parser-failure.js (random crash!!!)  
  JX_StopEngine();   
  EXC_BAD_ACCESS  
test-timers-unref-active.js  
  line 52  assert.equal(nbTimeouts, N);  
  AssertionError: 4 == 5 ( 0:0)