login with usernames including a dot (".") automatically closes session
Usernames including a dot cause an error for creating the session.
See in attached log: Feb 09 12:03:01 cloud gdm-password][99754]: pam_systemd(gdm-password:session): Failed to get user record: Invalid argument Feb 09 12:03:01 cloud gdm-password][99754]: gkr-pam: unable to locate daemon control file
Steps to Reproduce:
1.Create a user with a dot in it, e.g. "tony.stark"
2.Set a password for the user "tony.stark"
3.Login via gdm
Actual Results:
The screen blanks and then the login screen is shown again.