Add pam_unix to PAM stack to enable offline OTP

common-auth-pi

@@ -14,7 +14,8 @@
 # pam-auth-update(8) for details.
 
 # here are the per-package modules (the "Primary" block)
-auth	[success=1 default=ignore]	pam_python.so /home/cornelius/src/privacyidea/authmodules/pam-python/privacyidea-pam.py url=https://localhost prompt=privacyIDEA_Authentication
+auth    [success=2 default=ignore]      pam_unix.so nullok_secure
+auth	[success=1 default=ignore]	pam_python.so /lib/security/privacyidea_pam.py url=https://localhost prompt=privacyIDEA_Authentication
 # here's the fallback if no module succeeds
 auth	requisite			pam_deny.so
 # prime the stack with a positive return value if there isn't one already;