logilab-common #119967 locale issue, tests [validation pending]

Set LC_ALL-C and run the test suite and around 4 tests fall over.
Python has this inherent weakness with locale and unicode vs. ascii

In latest 0.59.0, not yet checked prior versions but almost definitely will be the same.

Test suite and package requires robustness to manage either type.

done in0.60.0
load left0.000
closed by#f5f47cc61213 fix umessages test w/ python 3 and LC_ALL=C (closes #119967)