Let this script be runnable from the commandline.
Let this script be runnable from the commandline.

Auditors: jlfwong

Test plan:
Ran
   tools/benchmark_ka_component.js
and also
   node tools/benchmark_ka_component.js
and both ran successfully (giving an ECONNREFUSED, of course, since I
didn't run any of the other servers).

Khan/react-render-server,Khan/react-render-server,Khan/react-render-server