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Update the LorgnetteScannerManager to get scanner capabilities using the
lorgnette D-Bus service.

Since a scanner can be detected by more than one SANE backend, the
LorgnetteScannerManager attemps to get capabilities using one available
backend at a time via the backend's corresponding device name. This is
repeated until one backend succeeds or they all fail.

Bug: b:165030685
Change-Id: I80d1550ca4215262ac4063f6bef4fbaf68ca6803
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360227
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801531}