Apart from adding new unit tests for covering new IMS OBv2.1 issuer,
some extra tests have been added to test existing issuers and confirm
they are still working as expected after the changes.
* New button allows to create standard issuer for nextcloud
* Since the endpoints url has to be https and nextcloud relys on the
baseurl to create the endpoints, the baseurl of issuers has now to be
https as well (or empty).
* Google's baseurl was changed to https (there was no reason not to),
whereas Facebook and Microsoft baseurls remain empty.
* In case of the creation of a nextcloud issuer, the baseurl is
required.
* Nextcloud requires the baseurl, therefore a parameter is added to
create_standard_issuer($type, $baseurl = false). That parameter not
required (or used) for anything but Nextcloud.
We added 2 fields to the model and we needed to update the tests.
I also removed some error_log from the rest client (very useful while developing)
Part of MDL-58220
