UP-4200 Decrypt password for portlets when replaying credentials

https://issues.jasig.org/browse/UP-4200

Only applies when using local login form to authenticate against DB or LDAP.
Would it be feasible to make `CachedPasswordUserInfoService` detect whether the password needs decrypting and decrypt only if needed?

Having a configuration point with documentation of how it ought to be configured is nice, I guess, but not having to configure it is even better.