[tests] Stop counting pickle bytes in ResultSet tests
Between python 2's pickle and cPickle implementations, the various
protocol versions added in python 3, the length of the pickled string is
completely unpredictable.
Instead, do a simple round trip and test a few attributes.
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