Issue #169: pam authentication does not work + fix (conservancy/kallithea)

[Silas De Munck]

New issue 169: pam authentication does not work + fix
https://bitbucket.org/conservancy/kallithea/issues/169/pam-authentication-does-not-work-fix

Silas De Munck:

In pam_auth.py

at line 126, user_data structure from above is overwritten by pwd.getpwnam.
results in exception at 136

fix:
- 126: rename user_data -> user_data2
- 128: rename user_data -> user_data2
(or similar)