Errors trying to add SAML Auth to an institution

[Dmitrii Metelkin]

Mahara version 17.04

I have two issues:

1 .
When you have php5-memcache extension enabled on your server, but don't use Memcache in Mahara, adding SAML Auth to an institution fails with an error:
 [SimpleSAML_Error_Error]: MEMCACHEDOWN

2. If I pass error from step 1, I'm having the following error:

 [SimpleSAML_Error_Exception]: You cannot set both the session.phpsession.limitedpath and session.cookie.path options.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8010

[Dmitrii Metelkin (dmitriim)]

In my patch, I have added an additional check for correct config of Memcache.
If it's not configured properly, then admin will get a message.
Also, you can't add SAML auth to an institution if Memcache is not configured.
Also, fixed missing help file.
Added description of $cfg->memcacheservers to a relevant file.
And finally, did small refactoring to get rid of duplicate code.

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/8010
Committed: https://git.mahara.org/mahara/mahara/commit/0491f2f431b53613c2f775512d711d92a731834d
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 0491f2f431b53613c2f775512d711d92a731834d
Author: Dmitrii Metelkin <email address hidden>
Date: Tue Sep 12 13:42:33 2017 +1000

Bug 1715802: Improve requirements checks for auth/saml

behatnotneeded

Change-Id: Iddb57a880675ec6097f19a597cd2e8f1083534ba