ISPN-3910 + ISPN-3911 HotRod authentication

https://issues.jboss.org/browse/ISPN-3910 HotRod Authentication
https://issues.jboss.org/browse/ISPN-3911 Authentication Server integration

For initial review only.

NB: a few things are still missing here:
- bridging of the security realm with the SecurityAuthenticationProvider in the server integration
- management of role mapping in the server integration
- example configurations