-RM-3694-MR-Remove errors in simple flow

Fix the "simple" login flow so that processing at the IdP can successfully complete and return to the SP.

must create session objects
fixed username

(from redmine: issue id 3694, created on 2016-06-15, closed on 2016-07-26)

Relations:
- child #3698
- child #3699
- child #3700
- child #3731
Uploads:
- mfa-flows-1.0-SNAPSHOT.jar build 15