Allow minimum information when creating a user via SAML

[Robert Lyon]

We need to allow the creation of a user with minimum details from SAML

With modern privacy laws some Identity Providers will not include identifying things like first name, last name, email address in their minimum packet of info about an authenticated user.

Mahara expect these to exist to create a new user, otherwise will throw an error.

To get passed this, by allowing just an unique identifier or username, we will need to create a config option to be set so the site can handle this.

And once the user is created the person logging in will be presented with the unset mandatory fields screen where they can fill in the missing information.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10652

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10652
Committed: https://git.mahara.org/mahara/mahara/commit/926b8d818bdf6c16ead5bc710d19763cac02c968
Submitter: Cecilia Vela Gurovic (<email address hidden>)
Branch: master

commit 926b8d818bdf6c16ead5bc710d19763cac02c968
Author: Robert Lyon <email address hidden>
Date: Sun Dec 8 09:57:53 2019 +1300

Bug 1855556: Allowing minimal SAML input to create new user

Having a flag that can be set for the site so a saml instance that
creates new users can do so with only username / institution present
in the authentication packet

behatnotneeded

Change-Id: Id3942a8e3388b2ccee8d97d37200bca8fa312914
Signed-off-by: Robert Lyon <email address hidden>