2. core: Adding support for returning password URL change to client

This patch performs the following:
1. Change to AuthenticationResult - no need to hold the detailedInfo object.
classes can extend AuthenticationResult and hold information in fields if neede
2. Handling fetching the password change URL and attaching it to the canDoAction
messages in case the password has expired.

Bug-Url: https://bugzilla.redhat.com/1053601
Change-Id: I0825b1624696e687d76b867f4844f7016819cf2c
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>