While attempting to create user that allready exist trough http://localhost:8181/auth/v1/users

following is showed

{
"message": "There was an internal error creating the user",
"details": "org.opendaylight.aaa.h2.persistence.StoreException: SQL Exception : org.h2.jdbc.JdbcSQLException: Unique index or primary key violation: \"PRIMARY_KEY_4D ON PUBLIC.USERS(USERID) VALUES ('test_user@xy', 3)\"; SQL statement:\ninsert into users (userid,domainid,name,email,password,description,enabled,salt) values(?,?,?,?,?,?,?,?) [23505-191]"
}

This is problem for two reasons

1. This error is not exactly user friendly, all the user needs to know here is "You are attemtping to create allready existing user"
2. And the more important, it directly exposes which schema/table contains user credentials.