Don't confuse the two different types of 'options' to roundtrip-test.js.

Command-line options and ParsoidConfig options should be handled
separately, for consistency.

Change-Id: I11310a00ce7d91a42f0e895edd17f48ab0b5ff89
Merge "Don't confuse the two different types of 'options' to roundtrip-test.js."