This is an update of the site registration admin page and some relevant
backend code to remove the mentions of moodle.net.
AMOS BEGIN
CPY [registerwithmoodleorg,core_admin],[registerwithmoodleorg,core_hub]
AMOS END
Site indicators shared with the registration hub used to have the hub
URL in the relevant setting names - such as site_name_httpsmoodlenet.
This upgrade step converts all such settings and drops the URL suffix
because we do not support alternative hubs any more.
Additionally the upgrade step renames the official hub and updates its
URL so that existing registrations with https://moodle.net are still
valid.
Rumor has it that some browsers may truncate the GET request to 2000 characters,
make sure that all important info is sent first
Everything else will be updated on the first registration update request.
The new setting will allow to host the temporary backup files
into a specific target directory. Defaults to '$CFG->tempdir/backup'.
Calling make_backup_temp_directory() checks that the required sub-directory
will be properly created under the new target directory.
Support for alternative hubs will be removed in 3.4
We can move all methods working with registration, course publishing and moodle.net
communication into separate namespace
