Test fingerprint reader support!

[Bastien Nocera]

Heya,

If you're feeling adventurous and you have a fingerprint reader, read
on. The feature is detailed at:
https://fedoraproject.org/wiki/Features/Fingerprint

You'll need:
- install the latest git snapshot of libfprint:
http://koji.fedoraproject.org/koji/taskinfo?taskID=917627
- rebuild and install the fprintd and fprintd-pam RPMs:
http://hadess.fedorapeople.org/fprintd/fprintd-0.1-1.fc10.src.rpm
(See also: https://bugzilla.redhat.com/show_bug.cgi?id=469955 )
- Modify your /etc/pam.d/system-auth-ac file, and add the line:
auth        sufficient    pam_fprintd.so
before the line:
auth        sufficient    pam_unix.so ...
See also https://bugzilla.redhat.com/show_bug.cgi?id=469418

You can now enroll a new fingerprint using fprintd-enroll, list
registered fingerprints using fprintd-list, and test verification using
fprintd-verify.

If you don't enroll a fingerprint, you just won't be asked for a
fingerprint.

Cheers

PS: If you break your system and can't log in anymore, it's not my
fault. Boot in single user mode, and remove the pam_fprint.so line from
the pam.d configuration.