LDAP User Cleanup

background job for user clean up

adjust user backend for clean up

register background job

remove dead code

dependency injection

make Helper non-static for proper testing

check whether it is OK to run clean up job. Do not forget to pass arguments.

use correct method to get the config from server

methods can be private, proper indirect testing is given

no automatic user deletion

make limit readable for test purposes

make method less complex

add first tests

let preferences accept limit and offset for getUsersForValue

DI via constructor does not work for background jobs

after detecting, now we have retrieving deleted users and their details

we need this method to be public for now

finalize export method, add missing getter

clean up namespaces and get rid of unnecessary files

helper is not static anymore

cleanup according to scrutinizer

add cli tool to show deleted users

uses are necessary after recent namespace change

also remove user from mappings table on deletion

add occ command to delete users

fix use statement

improve output

big fixes / improvements

PHP doc

return true in userExists early for cleaning up deleted users

bump version

control state and interval with one config.php setting, now ldapUserCleanupInterval. 0 will disable it. enabled by default.

improve doc

rename cli method to be consistent with  others

introduce ldapUserCleanupInterval in sample config

don't show last login as unix epoche start when no  login happend

less log output

consistent namespace for OfflineUser

rename GarbageCollector to DeletedUsersIndex and move it to user subdir

fix unit tests

add tests for deleteUser

more test adjustements

Conflicts:
	apps/user_ldap/ajax/clearMappings.php
	apps/user_ldap/appinfo/app.php
	apps/user_ldap/lib/access.php
	apps/user_ldap/lib/helper.php
	apps/user_ldap/tests/helper.php
	core/register_command.php
	lib/private/preferences.php
	lib/private/user.php

add ldap:check-user to check user existance on the fly

Conflicts:
	apps/user_ldap/lib/helper.php

forgotten file

PHPdoc fixes, no code change

and don't forget to adjust tests

* keep old static methods - mapped to new ones and deprecated
* removed deleteApp, getUsers, getApps because they are unused
* make AllConfig unit tests more robust against not cleaned up environments

This reverts commit 09fd34ee.

don't trigger update from checkPassword, it is already  called by userExists, this is enough.

do not write to database when the value is the same

add test cases. also split test classes in a file each, looks like only the first class is being executed

also appconfig shall not write to database if the value is unchanged

* test case added to avoid adding them later

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/owncloud/core/inspections/cdfecc4e-a37e-4233-8025-f0d7252a8720

Enabled analysis tools:
 - PHP Analyzer
 - JSHint
 - PHP Copy/Paste Detector
 - PHP PDepend

Conflicts:
	lib/private/vcategories.php

Signed-off-by: Florian Pritz <bluewind@xinu.at>