[7.0] missing arguments to logging statement in workers.py

in openerp/services/workers.py:

       def time_expired(n, stack):
            _logger.info('Worker (%d) CPU time limit (%s) reached.', config['limit_time_cpu'])

There is a missing parameter, which cause a stack trace in the logging module:

Traceback (most recent call last):
  File "/usr/lib/python2.7/logging/__init__.py", line 846, in emit
    msg = self.format(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 723, in format
    return fmt.format(record)
  File "/home/afayolle/work/customers/avosdim/buildout/parts/server/openerp/netsvc.py", line 150, in format
    logging.exception('while formatting %r', record)
  File "/home/afayolle/work/customers/avosdim/buildout/parts/server/openerp/netsvc.py", line 144, in format
    try:
  File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
    record.message = record.getMessage()
  File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
    msg = msg % self.args
TypeError: not enough arguments for format string