[storages] fix fs_importing side-effect on entity.data
When creating a new File object, if fs_importing is set,
we want entity.data to be the file content instead of the
filepath for the rest of the transaction.
(see test_bfss_fs_importing_transparency) for test implementation
To make this possible, the storage hooks (entity_added / entity_updated)
must return the correct value to set in the entity dict.
# -*- shell-script -*-
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#
# put here information about external resources used by your components,
# or to overides existing external resources configuration
#
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# CSS stylesheets to include in HTML headers
# uncomment the line below to use template specific stylesheet
# STYLESHEETS = DATADIR/cubes.%(cubename)s.css