[IMP] logging: Use the default python logging handler bound to stderr

Avoid messing up actual output with logs. Useful when using odoo shell in a
pipeline. Example:

echo "for i in env['res.partner'].search([]): print i.email" | ./odoo.py shell -d master | xargs -n1 echo cmd

openerp/addons/test_workflow/models.py

@@ -1,12 +1,16 @@
 # -*- coding: utf-8 -*-
+import logging
+
 import openerp.osv.orm
 
+_logger = logging.getLogger(__name__)
+
 class m(openerp.osv.orm.Model):
     """ A model for which we will define a workflow (see data.xml). """
     _name = 'test.workflow.model'
 
     def print_(self, cr, uid, ids, s, context=None):
-        print '  Running activity `%s` for record %s' % (s, ids)
+        _logger.info('Running activity `%s` for record %s', s, ids)
         return True
 
     def print_a(self, cr, uid, ids, context=None):

openerp/netsvc.py

@@ -137,6 +137,8 @@ def init_logger():
 
     # create a format for log messages and dates
     format = '%(asctime)s %(pid)s %(levelname)s %(dbname)s %(name)s: %(message)s'
+    # Normal Handler on stderr
+    handler = logging.StreamHandler()
 
     if tools.config['syslog']:
         # SysLog Handler
@@ -163,10 +165,6 @@ def init_logger():
                 handler = logging.FileHandler(logf)
         except Exception:
             sys.stderr.write("ERROR: couldn't create the logfile directory. Logging to the standard output.\n")
-            handler = logging.StreamHandler(sys.stdout)
-    else:
-        # Normal Handler on standard output
-        handler = logging.StreamHandler(sys.stdout)
 
     # Check that handler.stream has a fileno() method: when running OpenERP
     # behind Apache with mod_wsgi, handler.stream will have type mod_wsgi.Log,