logilab-common #1716053 clean up incestuous relationship between pytest and testlib [validation pending]

testlib should stay generic, and pytest specific things should live in pytest.py

prioritynormal
typeenhancement
done in1.1.0
load1.000
load left0.000
closed by#b2d560d76ee6 Move pytest-specific code from testlib to pytest
patchMove pytest-specific code from testlib to pytest [applied]