logilab-common #8967 modutils _xmlplus detection [rejected]

detected by launching pylint on a module using xml.etree result is the same whether pyxml is installed or not.

Good:

>>> print xml.__path__
['/usr/lib/python2.5/xml']
>>> print xml.etree.__path__
['/usr/lib/python2.5/xml/etree']
>>> print xml.etree.__file__
/usr/lib/python2.5/xml/etree/__init__.pyc

Bad:

>>> print xml.__path__
['/usr/lib/python2.5/site-packages/_xmlplus', '/usr/lib/python2.5/xml']
>>> print xml.etree.__path__
['/usr/lib/python2.5/xml/etree']
>>> print xml.etree.__file__
/usr/lib/python2.5/xml/etree/__init__.pyc