logilab-common #298658 generated config has unstable section ordering [validation pending]

Craig Hobbs reported on the mailing list:

This causes generated rcfiles (like those of pylint) to be output with random section order. The fix is simple - just sort the section item iteration (see below).

Bug can be reproduced with python 2 using PYTHONHASHSEED=random.

done in1.1.0
load left0.000
closed by#687b0d3e2aaa [configuration] Have a stable order for sections (closes #298658)
patch[configuration] Have a stable order for sections (closes #298658) [applied]