* Cherry Picking LDAP changes
* Adding missing merges
* Fixing remaining mentions of FeatureCacheFeature
* Fix jslint
* Fixing some failed tests
* Fixing cluster authentication issue, red tests
* Fixing ldap testsuite, adding trace logging
* Fixint ldap tesuite setup and LDAP recognition
(cherry picked from commit 686d28a779)
* Fixing wrong assert
* Adding changelog entry, making requested changes from code review
* Fixing dump_authentication, fix typos
* improvements found during code review
* oops
* more use of sessionstorage
* fix tests
* Fixing broken handling, disallowing adding of local users when disabled
* Fixing testInvalidGrants
* Removing undefined auth level externally
* Fixing previous commit
* added tests for ldap search mode
* intentionally removed `after` methods from tests
because they are executed before the tests start
no cleanup is performed right now after the authentication tests
however, a cleanup is done at start of every test
* ldap tests all modes
* forward port changes from 3.3
* added generated files
* forward port missing changes for web UI
* added generated files
* added generated files
* Switching from ttl to supervision based failover mechanism
* Allowing canceling of ongoing actions
* refactored asyncjobmanager
* refactoring some code
* adding read-only flag
* catching some exceptions to reduce log pollution, removing unnecessary code, removing tests for _changeMode
* fixing "createsANewDatabaseWithAnInvalidUser"
* auth = off does not longer make everyone superuser
* Fixing cluster_sync and maybe resilience
* do not use V8 variant of AQL functions in early optimization stage when a C++ variant is available
* additionally, simplify AQL function definitions and aliases
* warn when more than 90% of max mappings are in use
* added C++ variant of replication catchup
* added `--log.role` option
* updated CHANGELOG
* removed non-existing scheduler.threads option from config
* removed useless __FILE__, __LINE__ invocations
* updated CHANGELOG
* allow a priority V8 context
* remove TRI_CORE_MEM_ZONE
* try to fix Windows errors & warnings
* cleanup
* removed memory zones altogether
* exclude system collections from collection tests
* added V8 context lifetime control options `--javascript.v8-contexts-max-invocations` and `--javascript.v8-contexts-max-age`
* make thread scheduling take into account most of the tasks dispatched via the io service