OTP authentication will fail after logout event

Steps to reproduce

1- Login on aerogear-controller-demo with user: john / password: 123
2- Try google authenticator
3- Scan the barcode
4- Enter the OTP generated to your phone and submit
5- Logout
6. Login again and provide the OTP generated to your phone

It happens because the IDM is under development and user attributes configured here: https://github.com/aerogear/aerogear-security-picketbox/blob/master/src/main/java/org/jboss/aerogear/security/picketbox/idm/AuthenticationKeyProviderImpl.java#L57

Will never be persisted on PicketLink: https://github.com/picketlink/picketlink/blob/master/idm/impl/src/main/java/org/picketlink/idm/jpa/internal/JPAIdentityStore.java#L959