Allow a 'parent' saml auth instance update the roles for all the similiar instances

[Robert Lyon]

Based on the saml_create_institution_default flag and matching on the institutionidpentityid value

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/10706

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/10706
Committed: https://git.mahara.org/mahara/mahara/commit/7b6a5cec5454b0db60dc47de493332fc115d3150
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 7b6a5cec5454b0db60dc47de493332fc115d3150
Author: Robert Lyon <email address hidden>
Date: Fri Jan 10 16:55:10 2020 +1300

Bug 1859120: Allow the 'parent' auth to update the roles for 'children'

This is useful when multiple institutions are using the same IdP, eg
when using the 'saml_create_institution' flag.

It allows bulk update the role* values for all the institutions using
the same institutionidpendtityid by the ones designated in
'saml_create_institution_default' flag

behatnotneeded

Change-Id: I847acffcbc40bf6509b9587006dee68d46a217ee
Signed-off-by: Robert Lyon <email address hidden>