Fetching user tours used to fail on external_api::validate_context() and
require_login() calls if the user did not have the site policy agreed.
The patch introduces a check to see if the user is fully set up and
ready to use the site before attempting to load the tours.
All the setup/teardown/pre/post/conditions template methods
now are required to return void. This was warned with phpunit 7
and now is enforced.
At the same time, fix a few wrong function names,
provider data and param types, return statements...
David Mudrák