Rewrite Client.import_image() and add less-magical versions

Rather than have one function that can do 5 things and attempts to guess
what the user wanted, it's good to have a function for each possible
method of importing an image. Error cases are handled a lot better this
way.

The unit test test_import_image_from_file() was changed to be
test_import_image_from_bytes(), because if we try to import a temporary
file in the test, the 'data' parameter of the 'fake_request' object is
an instance of a funny internal type like <_io.BufferedReader
name='/tmp/tmpc9chux'> and it's very hard to match such a thing with
`mock.assert_called_with()`.

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