Add parsoid-parsertests-run-harder test; make more parsoid tests voting.

* parsoid-parse-tool-check, parsoid-roundtrip-test-check, and
  parsoid-jslint are not voting tests.
* Turned on the parsoid-parsertests-run-harder test.

Change-Id: I68e1b53b649065dda80bd692154717eca762cea3