By using a single equality instead of checking len() then zip()
to check one by one, pytest can find the common/missing elements
and print them nicely when the two lists are unequal.
Make the instance parameter of the base pattern lister optional and set
lister name to URL network location when not provided.
It simplifies lister creation when associated forge type have a lot of
instances in the wild (e.g. gitlab or cgit) while giving more details
about the listed forge instance.
Also process listers for forge with multiple instances (cgit, gitea,
gitlab, phabricator and tuleap) to ensure URL network location will be
used when instance parameter is not provided.
Related to T3403
