[MDL-34398] Develop grouplib caching - Moodle Tracker

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Testing Instructions:
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This patch has not made any changes to user interface or functionality. It is a performance improvement.
As such we can really only test that things behave exactly as the did before.

Run unit tests

Create a new course and give it a group mode.

Create a couple of groupings and several groups (assign students at the same time).

Map the groups to groupings.

Browse around the course as a teacher and make sure group things still work as expected.

Browse around as a student in a group and make sure things are fine for them as well.
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This patch has not made any changes to user interface or functionality. It is a performance improvement. As such we can really only test that things behave exactly as the did before. Run unit tests Create a new course and give it a group mode. Create a couple of groupings and several groups (assign students at the same time). Map the groups to groupings. Browse around the course as a teacher and make sure group things still work as expected. Browse around as a student in a group and make sure things are fine for them as well.
Affected Branches:
MOODLE_23_STABLE
Fixed Branches:
MOODLE_25_STABLE
Pull from Repository:
git://github.com/samhemelryk/moodle.git
Pull Master Branch:
wip-~~MDL-34398~~-m25-integration
Pull Master Diff URL:
https://github.com/samhemelryk/moodle/compare/11fbebb...wip-MDL-34398-m25-integration

Describe what $GROUPLIB_CACHE is and how it works.

caused a regression

MDL-42913 Group cache returns unexpected results when passing a field list that would cause the results to be indexed by a field other than id

Discovered while testing

MDL-37408 Check performance of group/import.php

has a non-specific relationship to

MDL-37673 Invalid definition of the core/groupdata persistent cache