underscore in password

```
ydb -e grpc://localhost:2136 -d /local scripting yql -s "CREATE USER testuser PASSWORD 'test_password'"
Status: PRECONDITION_FAILED
Issues:
<main>: Error: Execution, code: 1060
    <main>:1:1: Error: Executing CREATE USER
        <main>: Error: Password contains unacceptable characters, code: 2029
```

expected behavior - create user.