A previous change added the UI for displaying the "Waiting for verification"

state. This change adds the UI to enable and manipulate that state.

Created new comments via the comment dialog and the review dialog and

  verified that the "Require verification" checkbox correctly persisted into

  extra_data for both cases.
Checked the state transitions from open -> verify and verify -> closed

  for both "Fixed" and "Dropped" cases.
Ran js-tests.
Ran unit tests.