Try fix reauth bug

To reproduce bug we need these steps:
1. Run TestApp, auth with FBApp as user1
2. Press home button, activate FBApp
3. Log out in FBApp, and login as user2
4. Press home button, activate TestApp
5. Log out and auth again in TestApp
Want to see: new session for user2
But instead see: old session for user1

This commit should fix this bug. It tries to filter out
some strange responses from FBApp with old sessions