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Patch for "16.10_STABLE" branch: https://reviews.mahara.org/7674

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https://bugs.launchpad.net/bugs/1650995

Title:
  Alter how Auth SAML pairs idp metadata to an institution

Status in Mahara:
  Fix Committed
Status in Mahara 16.10 series:
  In Progress
Status in Mahara 17.04 series:
  Fix Committed

Bug description:
  Currently when we store idp metadata it saves to dataroot with name of
  the institution it was saved in.

  If other institutions want to use the same idp metadata they simply
  leave that field blank.

  Problems with this:

  1) If we delete the institution that first added the metadata the dataroot [institutionA].xml file is NOT deleted but if we add the same metadata to another institution's saml
  instance a new file is created so we have 2 versions of the same info
  in the dataroot: [institutionA].xml and [institutionB].xml

  2) We only record the info against one saml instance so we don't know
  what metadata the other saml instances are using as we leave the field blank in database

  What would be more useful is if we pair all saml instances needing the
  idp metadata together by having institutionidpentityid set for all
  institution's saml auth using it.

  Then instead of naming the dataroot's metadata file to
  match the institution shortname we name it to match the institutionidpentityid
  instead.

  So when we delete an institution or that institution stops using saml
  we can check to see if others are using the metadata and if not can
  safely delete the metadata.

  3) We can extend the idea in (2) and we could add metadata to saml
  instances by either pasting in the metadata or by specifying the idpentity
  value. via dropdown, of the installed idp metadata.

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