[fprint] [PATCHes] PolicyKit support

[Bastien Nocera]

Wicked!

Admins can now tell who is allowed to enroll new fingerprints, or verify
existing ones.

I kept the Claim/Release functions, as the PolicyKit actions don't need
to match D-Bus methods 1-for-1.

Once I get new fingerprint hardware, I'll want to add support for
identify and passing on image data to the front-end, for a snazzy look.

I'll probably have a play with a pam module based on dbus now.

Cheers
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