Making the Lenovo Thinkpad T450s fingerprint to work under Elementary GNU/Linux

This is originally a gist from Gina Häußge that I'm copying here for posterity purposes.

lsusb lists the fingerprint reader in the x240 as follows:

Bus 002 Device 003: ID 138a:0017 Validity Sensors, Inc.

There exists experimental driver support for this in a fork of libfprint for vfs5011 sensors

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