[server] fix unittest_security for py3k
- use source.binary_to_str instead of str(), helps when the backend
returns memoryviews
- fixup str vs bytes
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/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html