zabdig: list webscenarios and executed steps

[Jordi de Wal]

If zabdig would be able to show webscenarios those could be exported into different tools to keep it in sync (e.g. prometheus blackbox exporter).

Ideas for output could be something like this:
output for all scenarios for a specific host:

$ zabdig host-with-webscenario webscenario
host-with-webscenario    my-basic-webcheck
                         my-second-basic-webcheck
                         my-advanced-webcheck

output for all scenarios for a specific webcheck on that host:

$ zabdig host-with-webscenario webscenario my-basic-webcheck
my-basic-webcheck    1. https://basic-webcheck.com
                     2. https://basic-webcheck.com/login
                     3. https://basic-webcheck.com/status