* Use go-micro store to cache the roles
Add custom in-memory implementation
* replace redis with custom etcd implementation
* adjust table name for the cache in the roles manager
* Fix tests
* Fix sonarcloud issues
* Refactor for sonarcloud
* Allow configuration of cache per service
* Reuse parent context in etcd implementation
DELETE requess on /graph/v1.0/users also work when specifing a user by
name. For deleting the home space in that case we need to get the User's
id from the backend first.
Fixes: #4195
Up to now the /me/changePassword endpoint return a 500 Status when
issue a password change with the old password set to the wrong password.
This changes the code to return 400 (Bad Request) with an additional
message that the old password is wrong. This does not seem to weaken the
security of /me/changePassword (i.e. for allowing easier brute-force
attacks) as the endpoint is only available to already authenticated
users (and only for changing their own passwords)
See #4480
