Support RAF RAW format from Fuji cameras

When trying to import these files from a camera, Photos gives this error

"n files failed to import due to a file or hardware error"

I have tried importing the files from a memory card, and from a local folder in my home directory as well.

Launchpad Details: [#LP1677465](https://bugs.launchpad.net/bugs/1677465) Gaurav Pareek - 2017-03-30 06:22:20 +0000

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No source file or test is named. Reproduce the failure with Fuji RAF files, then locate the existing RAW import handling and verify the supported-format path; done means RAF files import successfully from both a memory card and a home-directory folder without the reported error.

Written by the indexing model from the issue text.