So as to increase transparency of the candidate verification checks,
add a --verbose option to all of the various candidate checking
command scripts. Supplying it once returns check result URLs for
clarity, while adding it twice also displays the query URLs used.
Set double verbosity for the check review tox testenv, to aid
election officials in reviewing nominees for valid candidacy.
Also update the Gerrit and Git URLs for the OpenDev transition and
correct a couple of docstrings for utility functions.
Change-Id: I5f6fa4e2c2c6058ba5090078bbdf9dd9f31f692e
c24fab9d73