Updated the BBB plugin to accept any API URL

[ianespana]

Some BBB service providers have configured their API URLs differently than the default https://bigbluebutton.mycompany.com/bigbluebutton/api/.

For instance, a service provider called MynaParrot utilizes https://api.mynaparrot.com/bigbluebutton/username/api/ as their API URL. This would not work with Canvas as it was expecting the URLs to be formatted like the default one, and thus limited the amount of services it'd work with quite severly.

Now we just make sure said URL ends with /api/ instead of assuming the default format is being used.

[CLAassistant]

All committers have signed the CLA.

[maths22]

Thank you for your contribution. While I like the idea of this change, as currently implemented this will break any existing plugin configurations. I would suggest either adding a migration to automatically transform existing plugin settings to use the new format (if you do that you'll need to migrate into a new field name in a predeploy migration (e.g. :address instead of :host) so that conferences still work after the migration has run before the new code is deployed) or I would suggest detecting if the url starts with http(s):// and using the new logic if it does and the old logic if it doesn't.

Also please don't update the language .yml files, those will be automatically updated separately through an automatic process.

[ianespana]

Oh, right. I'll implement the second way (check if https:// exists). As for the translations I did not know, so I will revert those

[ianespana]

Changes done, it now uses the old logic if http(s):// is not set in the domain configuration

[dustin-cowles]

Hi @ianespana , sorry this PR got missed. If you can verify it is still valid and resolve the conflicts, I can get it reviewed. Thanks!