[web/test] return the hash of uploaded files in FileUploadTC instead of their contents
json must be unicode, which doesn't go well with arbitrary file
contents. Compute the file hash instead, as we know the hexdigest is
(ascii) text.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/html/index.html
Files: /usr/share/doc/cubicweb-documentation/html/*