Validating Single Sign-on Token Handles

The caller can check if the session is valid using am_sso_is_valid_token(). If not valid, am_sso_validate_token() will flush the old session information from the local cache (if any) and fetch the latest session information from Access Manager.

am_sso_refresh_token() duplicates the functionality of am_sso_validate_token(). In addition, it will reset the idle time of the session on the server.